{"id":24232,"date":"2024-10-15T07:22:31","date_gmt":"2024-10-15T01:52:31","guid":{"rendered":"https:\/\/samacheerkalvi.guide\/?p=24232"},"modified":"2024-10-16T09:53:04","modified_gmt":"2024-10-16T04:23:04","slug":"samacheer-kalvi-9th-science-guide-chapter-16","status":"publish","type":"post","link":"https:\/\/samacheerkalvi.guide\/samacheer-kalvi-9th-science-guide-chapter-16\/","title":{"rendered":"Samacheer Kalvi 9th Science Guide Chapter 16 Applied Chemistry"},"content":{"rendered":"

Tamilnadu State Board New Syllabus Samacheer Kalvi 9th Science Guide<\/a> Pdf Chapter 16 Applied Chemistry Text Book Back Questions and Answers, Notes.<\/p>\n

Samacheer Kalvi 9th Science Solutions Chapter 16 Applied Chemistry<\/h2>\n

9th Science Guide Applied Chemistry Text Book Back Questions and Answers<\/h3>\n

I. Choose the correct answer :<\/span><\/p>\n

Question 1
\nOne Nanometre is
\n(a) 107<\/sup>metre
\n(b) 10-8<\/sup> metre
\n(c) 10-6<\/sup> metre
\n(d) 10-9<\/sup>metre
\nAnswer:
\n(d) 10-9 metre
\nHint: 1 nanometre is also called one billionth of a metre<\/p>\n

\"<\/p>\n

Question 2.
\nThe antibiotic Penicillin is obtained from……………….
\n(a) plant
\n(b) microorganism ,
\n(c) animal
\n(d) sunlight
\nAnswer:
\n(b) microorganism<\/p>\n

Question 3.
\n1% solution of Iodoform is used as
\n(a) antipyretic
\n(b) antimalarial
\n(c) antiseptic
\n(d) antacid
\nAnswer:
\n(c) antiseptic<\/p>\n

Question 4.
\nThe cathode of an electrochemical reaction involves ………………….
\n(a) oxidation
\n(b) reduction
\n(c) neutralisation
\n(d) catenation
\nAnswer:
\n(b) reduction
\nHint : It involves gain of electrons<\/p>\n

\"<\/p>\n

Question 5.
\nThe age of a dead animal can be determined by using an isotope of …………………
\n(a) carbon
\n(b) iodine
\n(c) phosphorous
\n(d) oxygen
\nAnswer:
\n(a) carbon
\nHint : C6<\/sub>14<\/sup> isotope is used<\/p>\n

Question 6.
\nWhich of the following does not contain natural dyes?
\n(a) Potato
\n(b) Beetroot.
\n(c) Carrot
\n(d) Turmeric
\nAnswer:
\n(a) Potato<\/p>\n

\"<\/p>\n

Question 7.
\nThis type of food protect us from deficiency diseases.
\n(a) Carbohydrates
\n(b) Vitamins
\n(c) Proteins
\n(d) Fats
\nAnswer:
\n(b) vitamins<\/p>\n

Question 8.
\nRadiochemistry deals with
\n(a) oxidants
\n(b) batteries
\n(c) isotopes
\n(d) nanoparticles
\nAnswer:
\n(e) isotopes<\/p>\n

\"<\/p>\n

Question 9.
\nThe groups responsible for the colour of an organic compound is called
\n(a) isotopes
\n(b) auxochrome
\n(e) chromogen
\n(d) chromophore
\nAnswer:
\n(d) chromophore<\/p>\n

Question 10.
\nChlorinated hydrocarbons are used as
\n(a) fertilizers ,
\n(b) pesticides
\n(c) food colourants
\n(d) preservatives
\nAnswer:
\nb) pesticides<\/p>\n

\"<\/p>\n

II. Fill In the blanks:<\/span><\/p>\n

1. ………….. is an electrochemical cell which converts electrical energy into chemical change
\n(Reaction).
\nAnswer:
\nElectrolytic cell<\/p>\n

2. Painkiller drugs are called ………………..
\nAnswer:
\nAnalgesics<\/p>\n

3. Indigo is a …………… dye.
\nAnswer:
\nVat<\/p>\n

4. ……………and……………..are macronutrients required for plant growth.
\nAnswer:
\nNitrogen, Phosphorous, and Potassium<\/p>\n

\"<\/p>\n

5. _____ is a chemical used in fingerprint analysis.
\nAnswer:
\nNinhydrin<\/p>\n

III. Match the following:<\/span><\/p>\n

Question1.<\/p>\n\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Antipyretics<\/td>\nLarge surface area<\/td>\n<\/tr>\n
Corrosion\u00a0 prevention<\/td>\nIodine – 131<\/td>\n<\/tr>\n
Hyperthyroidism<\/td>\nFever<\/td>\n<\/tr>\n
Nanoparticle<\/td>\nBodybuilding<\/td>\n<\/tr>\n
Proteins<\/td>\nElectroplating<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer:<\/p>\n\n\n\n\n\n\n\n\n
Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
Antipyretics<\/td>\nFever<\/td>\n<\/tr>\n
Corrosion\u00a0 prevention<\/td>\nElectroplating<\/td>\n<\/tr>\n
Hyperthyroidism<\/td>\nIodine – 131<\/td>\n<\/tr>\n
Nanoparticle<\/td>\nLarge surface area<\/td>\n<\/tr>\n
Proteins<\/td>\nBodybuilding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

IV. Answer briefly :<\/span><\/p>\n

Question 1.
\nWhat is Radio Carbon Dating?
\nAnswer:
\nRadiocarbon dating is a method by which the age of fossil wood or animal is determined using the C-14 isotope.<\/p>\n

Question 2.
\nWhat are called Anaesthetics? How are they classified?
\nAnswer:
\nThe drugs which cause loss of sensation are called Anaesthetics.
\nTypes of Anaesthetics<\/p>\n

General anesthetics: They are the agents, which bring about loss of all modalities of sensation, particularly pain along with \u2018reversible\u2019 loss of consciousness.
\nLocal anesthetics: They prevent the pain sensation in localised areas without affecting the degree of consciousness.<\/p>\n

\"<\/p>\n

Question 3.
\nWhat is the need for chemical fertilizers in crop fields?
\nAnswer:
\nThe need for chemical fertilizers In crop fields is to supply essential micro and macronutrients required for crop growth.<\/p>\n

Question 4.
\nWhat is Forensic chemistry related to?
\nAnswer:
\nForensic chemistry applies scientific principles, techniques, and methods to the investigation of crime.<\/p>\n

\"<\/p>\n

V. Answer in detail :<\/span><\/p>\n

Question 1.
\nExplain the types of dyes based on their method of application.
\nAnswer:
\nDyes are classified in two ways, one, based on the method of application and others on their parent structure.
\nBased on the method of application:<\/p>\n

    \n
  • Acid dyes: These are acidic in nature and used for dyeing animal fibres and synthetic fibres. These can be used for protein fibre such as wool and silk. E.g. Picric acid, Naphthol yellow-s<\/li>\n
  • Basic dyes: These are basic dyes containing basic group (- NH2<\/sub>,- NHR, – NR2<\/sub>). They are used for dyeing animal fibres and plant fibres.<\/li>\n
  • Mordant dyes or Indirect dyes: These dyes have a poor affinity for cotton fabrics and hence do not dye directly. They require pretreatment of the fibre with a mordant. Mordant (latin: mordere = to bite) is a substance which can be fixed to the fibre and then can be combined with the dye to form an insoluble complex called lake. Aluminium, chromium, and iron salts are widely used as mordants. E.g. alizarin.<\/li>\n
  • Direct dyes: They have high affinity for cotton, rayon and other cellulose fibre. So they are applied directly as they fix firmly on the fabric. E.g. Congo red<\/li>\n
  • Vat dyes: It can be used only on cotton and, not on silk and wool. This dyeing is a continuous process and is carried out in a large vessel called vat. So it is called as vat dye. E.g. Indigo<\/li>\n<\/ul>\n

    Question 2.
    \nName various food additives and explain their functions.
    \nAnswer:
    \n\"Samacheer<\/p>\n

    VI. Higher Order Thinking Skills :<\/span><\/p>\n

    Question 1.
    \nBatteries that are used in mobile phone can be recharged. Likewise, can you recharge the batteries used in watches? justify your answer.
    \nAnswer:
    \nThe type of batteries used in watches is Primary cell. (Mercury-Oxide battery)
    \nThe type of batteries are used in mobile phone is Secondary cell. (Lithium -ion polymer battery)
    \nThe differences between primary and secondary cell are as follow:<\/p>\n\n\n\n\n\n
    Primary Cell<\/td>\nSecondary cell<\/td>\n<\/tr>\n
    1. The chemical reaction of primary cell is irreversible.<\/td>\nThe chemical reaction is reversible.<\/td>\n<\/tr>\n
    2. Hence it can not be recharged.<\/td>\nHence it can be recharged.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Question 2.
    \nSudha met with a fire accident. What kind of drug(s), she must take?
    \nAnswer:
    \nAnalgesics are to be administered to reduce the pain followed by antibiotics to prevent infection by microbes.<\/p>\n

    \"<\/p>\n

    Question 3.
    \nThe soil pH of cropland is 5. What kind of fertilizers should be used in that land?
    \nAnswer:<\/p>\n

      \n
    • pH<\/sup> of 5 indicates the soil is Acidic.<\/li>\n
    • So alkaline fertilizers should be used.
      \n(e.g.,) Potash fertilizers, Nitrogen fertilizers.<\/li>\n<\/ul>\n

      Intext Activities<\/strong><\/p>\n

      ACTIVITY – 1<\/span><\/p>\n

      With the help of your teacher, construct the galvanic cell using lemon and potato. Identify their anode, cathode and electrolyte.
      \nAim: To construct a galvanic cell using lemon (or) potato
      \nMaterials required :<\/p>\n

        \n
      1. A large fresh juicy lemon,<\/li>\n
      2. Zinc coated nail,<\/li>\n
      3. Small copper coin,<\/li>\n
      4. LED light,<\/li>\n
      5. Connecting wires<\/li>\n<\/ol>\n

        Procedure :<\/p>\n

          \n
        1. Insert the copper coin into the lemon.<\/li>\n
        2. Push a zinc-coated nail into the other side of the lemon.<\/li>\n
        3. The copper coin and zinc-coated nail are connected to a low voltage LED bulb.<\/li>\n
        4. Now observe the results, (happenings).<\/li>\n<\/ol>\n

          Observation:<\/p>\n

            \n
          1. Copper coin acts as the cathode, zinc-coated nail acts as Anode. Lemon juice acts as an electrolyte.<\/li>\n
          2. We observe glow of LED light, which confirms the electricity to flow through the lemon.<\/li>\n<\/ol>\n

            Conclusion: Galvanic cell usifi^lpmon is constructed.<\/p>\n

            \"<\/p>\n

            9th Science Guide Applied Chemistry Additional Important Questions and Answers<\/h3>\n

            I. Choose the correct answer :<\/span><\/p>\n

            Question 1.
            \nNanoparticles are unstable when they come in contact with ………………..
            \n(a) air
            \n(b) Hydrogen
            \n(c) Oxygen
            \n(d) all the above
            \nAnswer:
            \n(c) Oxygen<\/p>\n

            Question 2.
            \nWhich is the incorrect statement in the following?
            \n(a) The structure of nano material is in between an atom and bulk material.
            \n(b) Nanomaterials exist in the corresponding bulk materials.
            \n(c) Nanomaterials have the extremely large surface area to volume ratio.
            \n(d) SEM is used analyse the surface properties of a nanoparticle with high resolution.
            \nAnswer:
            \n(b) Nanomaterials exist in the corresponding bulk materials<\/p>\n

            \"<\/p>\n

            Question 3.
            \nWhich anesthetic forms a toxic carbonyl chloride?
            \n(a) Nitrous oxide
            \n(b) Ether
            \n(c) Chloroform
            \n(d) Iodoform
            \nAnswer:
            \n(c) Chloroform<\/p>\n

            Question 4.
            \nParacetamol is a …………….
            \n(a) Analgesic
            \n(b) Antiseptic
            \n(c) Antimalarial
            \n(d) Antipyretic
            \nAnswer:
            \n(c) Antipyretic<\/p>\n

            Question 5.
            \nThe antiseptic used for cleansing the wounds is ………………..
            \n(a) Phenol
            \n(b) Iodoform
            \n(C) Ether
            \n(d) Hydrogen peroxide
            \nAnswer:
            \n(d) Hydrogen peroxide<\/p>\n

            \"<\/p>\n

            Question 6.
            \nAntimalarial drug obtained from Cinchona bark is ……………………
            \n(a) Quinine
            \n(b) Morphine.
            \n(e) Primaquine
            \n(d) Pyrimethamine
            \nAnswer:
            \n(a) Quinine<\/p>\n

            Question 7.
            \nThe drug that \u00a1s known as \u201cMiracle drug\u201d is ………………….
            \n(a) Chloroquinine
            \n(b) Penicillin
            \n(C) Aspirin. .
            \n(d) Par\u00e0cetamol
            \nAnswer:
            \n(b) Penicillin<\/p>\n

            \"<\/p>\n

            Question 8.
            \nIn Daniel cell, saturated solution of potassium chloride (KCl) acts as ……………..
            \n(a) Anode
            \n(b) Cathode
            \n(c) Salt bridge
            \n(d) Electrolyte
            \nAnswer:
            \n(c) Salt bridge<\/p>\n

            Question 9.
            \nThe process of purifying metals by electrolysis \u00a1s known as ……………..
            \n(a) Electroplating
            \n(b) Electrorefining
            \n(e) Electromanufacturing
            \n(d) None of these
            \nAnswer:
            \n(b) Electrorefining<\/p>\n

            Question 10.
            \nWhich one among the following statements is correct?
            \n(a) Galvanic cell converts electrical energy into chemical energy.
            \n(b) Reduction takes place at the anode.
            \n(c) Oxidation reaction takes place at the cathode.
            \n(d) None of these
            \nAnswer:
            \n(d) None of these<\/p>\n

            \"<\/p>\n

            Question 11.
            \nIsotopes are atoms with different number of ………………………
            \n(a) protons
            \n(b) neutrons
            \n(c) electrons
            \n(d) None of these
            \nAnswer:
            \n(b) neutrons<\/p>\n

            Question 12.
            \nThe radioisotope used for location of blood clot and circulation disorders is …………………..
            \n(a) Na – 24
            \n(b) I – 131
            \n(c) Fe – 59
            \n(d) Co – 60
            \nAnswer:
            \n(a) Na – 24<\/p>\n

            \"<\/p>\n

            Question 13.
            \nThe dye that can only be used on cotton is …………………….
            \n(a) Mordant dye
            \n(b) Vat dye
            \n(c) Direct dye
            \n(d) Basic dye
            \nAnswer:
            \n(b) Vat dye<\/p>\n

            Question 14.
            \nWhich one of the following is a flavour enhancer?
            \n(a) Sodium nitrite
            \n(b) Sodium benzoate
            \n(c) Cyclamate
            \n(d) Monosodium Glutamate
            \nAnswer:
            \n(d) Monosodium Glutamate<\/p>\n

            Question 15.
            \nThe compound that gets redUced \u00a1n the alcohol test is ……………………
            \n(a) Silver nitrate
            \n(b) Sulphuric acid
            \n(C) Water
            \n(d) Potassium dichromate
            \nAnswer:
            \n(d) Potassium dichromate<\/p>\n

            \"<\/p>\n

            II. Fill in the blanks:<\/span><\/p>\n

            1. Nanotechnology deals with materials which are smaller than …………………..
            \nAnswer:
            \n100 nanometres<\/p>\n

            2. The metallic nanoparticles can be used as ………………….
            \nAnswer:
            \nVery active catalysts<\/p>\n

            3. Nanoparticle substances are incorporated in fabrics to prevent …………………..
            \nAnswer:
            \nthe growth of bacteria<\/p>\n

            \"<\/p>\n

            4. The word “drug” is derived from the French word “droque” which means a ………………..
            \nAnswer:
            \ndry herb<\/p>\n

            5. …………… is the safest of the anesthetic drugs.
            \nAnswer:
            \nNitrus oxide<\/p>\n

            6. The Analgesics are also called as …………………
            \nAnswer:
            \nPain killer (or) Pain relievers<\/p>\n

            \"<\/p>\n

            7. ………………. produce sleep and unconsciousness.
            \nAnswer:
            \nNarcotics<\/p>\n

            8. Antiseptics are used internally to treat infections of the …………… and ……………..
            \nAnswer:
            \nIntestine, Bladder<\/p>\n

            9. Malaria is a ……………… borne disease.
            \nAnswer:
            \nvector<\/p>\n

            10. ………………. is used as an additive with other antimalarial drugs.
            \nAnswer:
            \nChloroquine<\/p>\n

            \"<\/p>\n

            11. ……………. is extensively used for rheumatic fever, narrowing of the heart wall, bronchitis, and pneumonia.
            \nAnswer:
            \nPenicillin<\/p>\n

            12. …………… is due to an imbalance in the acidity in the stomach.
            \nAnswer:
            \nBurning sensation<\/p>\n

            13. The solution having ions is called ………………..
            \nAnswer:
            \nElectrolyte<\/p>\n

            14. …………….. is the loss of electrons.
            \nAnswer:
            \nOxidation<\/p>\n

            \"<\/p>\n

            15. The process of depositing a thin layer of one metal over another metal by the process of electrolysis is called …………………….
            \nAnswer:
            \nElectroplating<\/p>\n

            16. When metals of a very high degree of purity are required,………………… is done.
            \nAnswer:
            \nElectrorefining<\/p>\n

            17. The isotope used in Radiocarbon dating is …………………..
            \nAnswer:
            \nC-14<\/p>\n

            \"<\/p>\n

            18. The chromophore and auxochrome theory was proposed by ……………………
            \nAnswer:
            \nOtto Witt<\/p>\n

            19. ……………… is one of the main criteria to be considered for the selection of crop (or) remediation of soil.
            \nAnswer:
            \nSoil pH<\/sup><\/p>\n

            20. Vitamin C is also powerful ……………….. that prevents food from oxidising.
            \nAnswer:
            \nAntioxidant<\/p>\n

            21. ……………. is one of the most important evidence in crime investigation.
            \nAnswer:
            \nFingerprint<\/p>\n

            \"<\/p>\n

            III. Match the following:<\/span><\/p>\n

            Question 1.<\/p>\n\n\n\n\n\n\n\n\n
            Name of the Drug<\/td>\nPurpose<\/td>\nExample<\/td>\n<\/tr>\n
            1. Antipyretics<\/td>\nKills the microorganism<\/td>\nChloroform<\/td>\n<\/tr>\n
            2. Anaesthetics<\/td>\nPain reliever<\/td>\nNovalgin<\/td>\n<\/tr>\n
            3. Antiseptics<\/td>\nReduction of fever<\/td>\nparacetamol<\/td>\n<\/tr>\n
            4. Analgesics<\/td>\nCure for malaria<\/td>\nQuinine<\/td>\n<\/tr>\n
            5. Antimalarial<\/td>\nLoss of sensation<\/td>\nHydrogen peroxide<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Answer:<\/p>\n\n\n\n\n\n\n\n\n
            Name of the Drug<\/td>\npurpose<\/td>\nExample<\/td>\n<\/tr>\n
            1. Antipyretics<\/td>\nReduction of fever<\/td>\nparacetamol<\/td>\n<\/tr>\n
            2. Anaesthetics<\/td>\nLoss of sensation<\/td>\nChloroform<\/td>\n<\/tr>\n
            3. Antiseptics<\/td>\nKills the microorganism<\/td>\nHydrogen peroxide<\/td>\n<\/tr>\n
            4. Analgesics<\/td>\nPain reliever<\/td>\nNovalgin<\/td>\n<\/tr>\n
            5. Antimalarial<\/td>\nCure for malaria<\/td>\nQuinine<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Question 2.<\/p>\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Cathodic electrolyte<\/td>\nPotassium chlorate (KClO3<\/sub>)<\/td>\n<\/tr>\n
            Anodic electrolyte<\/td>\nPotassium chloride (KCl)<\/td>\n<\/tr>\n
            Salt bridge<\/td>\nsulphate CuSO4<\/sub><\/td>\n<\/tr>\n
            Electro manufacturing<\/td>\nZinc sulphate(ZnSO4<\/sub>)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Answer:<\/p>\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Cathodic electrolyte<\/td>\nCopper sulphate CuSO4<\/sub><\/td>\n<\/tr>\n
            Anodic electrolyte<\/td>\nZinc sulphate(ZnSO4<\/sub>)<\/td>\n<\/tr>\n
            Salt bridge<\/td>\nPotassium chloride (KCl)<\/td>\n<\/tr>\n
            Electro manufacturing<\/td>\nPotassium chlorate (KClO3<\/sub>)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \"<\/p>\n

            Question 3.<\/p>\n\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Phosphorous-30<\/td>\nCancer<\/td>\n<\/tr>\n
            Iodine-131<\/td>\nPregnancy disorder<\/td>\n<\/tr>\n
            Cobalt-60<\/td>\nHyperthyroidism<\/td>\n<\/tr>\n
            Iron-59<\/td>\nBlood disorder<\/td>\n<\/tr>\n
            Sodium-24<\/td>\nCirculation disorder<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Answer:<\/p>\n\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Phosphorous-30<\/td>\nBlood disorder<\/td>\n<\/tr>\n
            Iodine-131<\/td>\nHyperthyroidism<\/td>\n<\/tr>\n
            Cobalt-60<\/td>\nCancer<\/td>\n<\/tr>\n
            Iron-59<\/td>\nPregnancy disorder<\/td>\n<\/tr>\n
            Sodium-24<\/td>\nCirculation disorder<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Question 4.<\/p>\n\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Indirect dyes<\/td>\nCongo red<\/td>\n<\/tr>\n
            Direct dyes<\/td>\nAlizarin<\/td>\n<\/tr>\n
            Vat dyes<\/td>\nMethylene blue<\/td>\n<\/tr>\n
            Basic dyes<\/td>\nPicric acid<\/td>\n<\/tr>\n
            Acid dyes<\/td>\nIndigo<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            Answer:<\/p>\n\n\n\n\n\n\n\n\n
            Column I<\/td>\nColumn II<\/td>\n<\/tr>\n
            Indirect dyes<\/td>\nAlizarin<\/td>\n<\/tr>\n
            Direct dyes<\/td>\nCongo red<\/td>\n<\/tr>\n
            Vat dyes<\/td>\nIndigo<\/td>\n<\/tr>\n
            Basic dyes<\/td>\nMethylene blue<\/td>\n<\/tr>\n
            Acid dyes<\/td>\nPicric acid<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \"<\/p>\n

            IV. State whether true or false. If false, correct the statement:<\/span><\/p>\n

            1. Nanoparticles are easy to synthesis, isolate, and apply.
            \nAnswer:
            \nFalse,
            \nCorrect statement: Nanoparticles are difficult to synthesis, isolate, and apply.<\/p>\n

            2. When cancer occurs, cells are reproduced in a controlled manner.
            \nAnswer:
            \nFalse.
            \nCorrect statement: When cancer occurs, cells are reproduced in an uncontrolled manner.<\/p>\n

            3. General anaesthetics cause pain along with ‘reversible’ loss of consciousness
            \nAnswer:
            \nFalse.
            \nCorrect statement: General anaesthetics relieve pain along with reversible loss of consciousness.<\/p>\n

            \"<\/p>\n

            4. Malaria decreases body temperature.
            \nAnswer:
            \nFalse.
            \nCorrect statement: Malaria increases the body temperature<\/p>\n

            5. High concentration of antibiotics is needed for Effective action.
            \nAnswer:
            \nFalse. .
            \nCorrect statement: Low concentration of antibiotics is needed for effective action.<\/p>\n

            6. Antacids provide relief from burning sensation in the stomach.
            \nAnswer:
            \nTrue,<\/p>\n

            \"<\/p>\n

            7. In Daniel’s cell, Zinc metal acts as the cathode, and Copper metal acts as Anode.
            \nAnswer:
            \nFalse.
            \nCorrect statement: In Daniel’s cell, Zinc metal acts as Anode, and Copper metal acts as Cathode.<\/p>\n

            8. Radioisotopes can be easily detected and estimated quantitatively.
            \nAnswer:
            \nTrue.<\/p>\n

            9. Dyes are aromatic compounds originated from plants and insects.
            \nAnswer:
            \nTrue.<\/p>\n

            \"<\/p>\n

            10. Dye should be fast to light.
            \nAnswer:
            \nTrue.<\/p>\n

            11. Vinegar is used as an antioxidant.
            \nAnswer:
            \nFalse.
            \nCorrect statement: Vinegar is used as a preservative.<\/p>\n

            12. Reduction of alcohol results in oxidation of dichromate to chromic ion.
            \nAnswer:
            \nFalse.
            \nCorrect statement: Oxidation of alcohol results in a reduction of dichromate to chromic ion<\/p>\n

            \"<\/p>\n

            V. Assertion and Reason type:<\/span><\/p>\n

            Mark the correct choice as:
            \n(a) If both assertion and reason are true and Reason is the correct explanation of Assertion.
            \n(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
            \n(c) If assertion is true but reason is false.
            \n(d) If assertion is false but reason is true.<\/p>\n

            Question 1.
            \nAssertion (A) : Nanoparticles interact with impurities.
            \nReason (R) : Nanoparticles are less reactive.
            \nAnswer:
            \n(c) Assertion is true but the reason is false
            \nReason (R) : Nanoparticles are highly reactive.<\/p>\n

            Question 2.
            \nAssertion (A) : Antiseptic is a substance that prevents infections caused by disease-causing pathogens.
            \nReason (R) : Antiseptics either kill the microorganism or prevent their growth.
            \nAnswer:
            \n(a) Both assertion and reason are true and Reason is the correct explanation of Assertion<\/p>\n

            \"<\/p>\n

            Question 3.
            \nAssertion (A) : After eating fruits (or) vegetables, one may feel uncomfortable due to a burning sensation.
            \nReason (R) : Burning sensation is due to an imbalance in the acidity of the stomach.
            \nAnswer:
            \n(d) Assertion is false but the reason is true
            \nAssertion (A) : After eating oily and spicy foods, one may feel uncomfortable due to a burning sensation.<\/p>\n

            Question 4.
            \nAssertion (A) : Metals like iron are electroplated with chromium.
            \nReason (R) : Electroplating is done to protect chromium from rusting.
            \nAnswer:
            \n(c) Assertion is true but reason is false
            \nReason (R) : Electroplating is done to protect iron from rusting.<\/p>\n

            Question 5.
            \nAssertion (A) : It is possible to detect alcohol drunken drivers.
            \nDetection is done through the electrochemical redox reaction of alcohol.
            \nAnswer:
            \n(a) Both assertion and reason are true and Reason is the correct explanation of Assertion<\/p>\n

            \"<\/p>\n

            Question 6.
            \nAssertion (A) : Our retinal print can be forged.
            \nReason (R) : Our retinal print is unique.
            \nAnswer:
            \n(d) Assertion is false but reason is true
            \nAssertion ( A) : Our retinal print cannot be forged.<\/p>\n

            VI. Very short answer type :<\/span><\/p>\n

            Question 1.
            \nWhat are the specific qualities of nanoparticles?
            \nAnswer:<\/p>\n

              \n
            • Larger surface area<\/li>\n
            • High surface energy.<\/li>\n
            • Spatial confinement<\/li>\n
            • Reduced imperfections.<\/li>\n<\/ul>\n

              Question 2.
              \nList out the instruments used to analyse nanoparticles.
              \nAnswer:<\/p>\n

                \n
              • Scanning Electron Microscope (SEM)<\/li>\n
              • Tunneling Electron Microscope (TEM).<\/li>\n
              • Atomic Force Microscope (AFM).<\/li>\n<\/ul>\n

                \"<\/p>\n

                Question 3.
                \nWhat is antipyretics?
                \nAnswer:
                \nAntipyretics are the compounds used to reduce fever, (i.e.) lowering the body temperature to normal.<\/p>\n

                Question 4.
                \nHow are antiseptics used?
                \nAnswer:
                \nExternal use: To cleanse wounds.
                \nInternal use: To treat infections of the intestine and bladder.<\/p>\n

                Question 5.
                \nMention the uses of Penicillin.
                \nAnswer:
                \nPenicillin is used for<\/p>\n

                  \n
                • Rheumatic fever,<\/li>\n
                • Narrowing of the heart wall.<\/li>\n
                • Bronchitis,<\/li>\n
                • Pneumonia.<\/li>\n<\/ul>\n

                  \"<\/p>\n

                  Question 6.
                  \nWhat are the main sources of Antibiotics?
                  \nAnswer:
                  \nMain sources of Antibiotics are<\/p>\n

                    \n
                  • Bacteria<\/li>\n
                  • Fungi and<\/li>\n
                  • Actinomycetes.<\/li>\n<\/ul>\n

                    Question 7.
                    \nName any five natural antibiotics.
                    \nAnswer:<\/p>\n

                      \n
                    • Honey<\/li>\n
                    • Garlic<\/li>\n
                    • Ginger<\/li>\n
                    • Neem<\/li>\n
                    • Turmeric.<\/li>\n<\/ul>\n

                      Question 8.
                      \nWhat is an Electrochemical cell?
                      \nAnswer:
                      \nA device that makes use of a chemical change to produce electricity (or) electricity to produce chemical change is called an Electrochemical cell.<\/p>\n

                      \"<\/p>\n

                      Question 9.
                      \nWhat is a Daniel cell?
                      \nAnswer:
                      \nDaniel cell is a type of galvanic cell in which zinc metal acts as anode and copper metal as cathode.<\/p>\n

                      Question 10.
                      \nWhat is radioactive decay?
                      \nAnswer:<\/p>\n

                        \n
                      • The unstable isotopes of elements lose their energy in the form of radiation to become stable.<\/li>\n
                      • This phenomenon is called radioactive decay.<\/li>\n<\/ul>\n

                        Question 11.
                        \nWhat is Vermicompost?
                        \nAnswer:
                        \nVermicompost is one of the natural fertilizers produced from domestic wastes.<\/p>\n

                        \"<\/p>\n

                        Question 12.
                        \nWhat is a balanced diet?
                        \nAnswer:
                        \nA diet that contains all the three foods such as (i) Bodybuilding foods, (ii) Energy giving foods, and (iii) Protective foods in the right proportion are called a Balanced diet.<\/p>\n

                        Question 13.
                        \nMention the use of a Biometric system.
                        \nAnswer:
                        \nThe biometric system compares the body prints to the specimen data stored in the system to verify the identity of a person.<\/p>\n

                        VII. Answer briefly :<\/span><\/p>\n

                        Question 1.
                        \nWhat is called as Applied Chemistry?
                        \nAnswer:
                        \nApplication of chemical principles and theories to various fields in order to achieve specific results or to solve real-world problems is called applied chemistry.<\/p>\n

                        \"<\/p>\n

                        Question 2.
                        \nWrite short notes on nanochemistry.
                        \nAnswer:<\/p>\n

                          \n
                        • Nanochemistry is a branch of nanoscience, that deals with the chemical applications of nanomaterials in nanotechnology.<\/li>\n
                        • It involves the synthesis and manipulation of materials at the atomic and molecular level.<\/li>\n<\/ul>\n

                          Question 3.
                          \nMention medical applications of Nanorobotics.
                          \nAnswer:<\/p>\n

                            \n
                          • Nanorobotics is used in medicine and space technology.<\/li>\n
                          • It plays important role in Bio-medicine in the treatment of cancer.<\/li>\n<\/ul>\n

                            Question 4.
                            \nDefine Drug.
                            \nAnswer:
                            \nAccording to the World Health Organisation (WHO),
                            \nDrug is a substance or product that is used or intended to be used to modify or explore physiological systems or pathological states for the benefits of the recipient.<\/p>\n

                            \"<\/p>\n

                            Question 5.
                            \nWhat is an Analgesics? How is it useful?
                            \nAnswer:<\/p>\n

                              \n
                            • Analgesics are compounds which relieve all sorts of pains without the loss of consciousness.<\/li>\n
                            • It is useful to treat
                              \n(a) Headaches
                              \n(b) Myalgia and
                              \n(c) arthralgia.<\/li>\n<\/ul>\n

                              Question 6.
                              \nWhat is known is Antibiotics?
                              \nAnswer:
                              \nMany microorganisms (bacteria, fungi, and molds) produce certain chemicals which inhibit the growth (or) metabolism of some other disease-causing microorganism. Such chemical compounds are known as Antibiotics.<\/p>\n

                              Question 7.
                              \nWrite brief notes on processes involved in cell reactions.
                              \nAnswer:
                              \nAn electrochemical cell involves two reactions simultaneously.<\/p>\n

                                \n
                              • Oxidation : Oxidation is the loss of electrons, that takes place at the anode.
                                \nMetal \u2192 Metal ion + electron(s)<\/li>\n
                              • Reduction: Reduction is the gain of electrons, that takes place at the cathode.
                                \nMetal ion + electron(s) \u2192 Metal.<\/li>\n<\/ul>\n

                                \"<\/p>\n

                                Question 8.
                                \nHow does a galvanic cell produce electricity?
                                \nAnswer:<\/p>\n

                                  \n
                                • At the anode, oxidation takes place which releases electrons.<\/li>\n
                                • These electrons are attracted by the cathode.<\/li>\n
                                • Thus electrons flowing from anode to cathode produce electricity.<\/li>\n<\/ul>\n

                                  Question 9.
                                  \nMention the applications of electroplating with an example.
                                  \nAnswer:
                                  \nApplications of Electroplating :<\/p>\n

                                    \n
                                  • Electroplating is done to protect the metal from corrosion, (e.g) chrome -plating.<\/li>\n
                                  • Electroplating is done to beautify the surface of a metal, (e.g) Gold plating.<\/li>\n
                                  • Broken parts of machinery require electrodeposition of metal between broken parts.<\/li>\n<\/ul>\n

                                    Question 10.
                                    \nList out the characteristics of Dye.
                                    \nAnswer:
                                    \nCharacteristics of Dye:<\/p>\n

                                      \n
                                    • Dye should have a suitable colour.<\/li>\n
                                    • Dye should be able to fix itself.<\/li>\n
                                    • Dye should be fast to light,<\/li>\n
                                    • Dye should be resistant to the action of water, dilute acids, and alkalies.<\/li>\n<\/ul>\n

                                      \"<\/p>\n

                                      Question 11.
                                      \nDefine Pesticides.
                                      \nAnswer:
                                      \nAccording to the World Health Organisation (WHO),
                                      \nPesticides are chemical compounds that are used to kill pests including insects, rodents, fungi, and unwanted plants (weeds).<\/p>\n

                                      Question 12.
                                      \nHow can Fingerprints be identified?
                                      \nAnswer:<\/p>\n

                                        \n
                                      • Fingerprints on smooth surfaces can be identified by the application of light or dark powder.<\/li>\n
                                      • Occult (hidden) Fingerprints are made visible by the use of Ninhydrin, which turns purple.<\/li>\n
                                      • Fingerprints can be made visible by high powered laser light.<\/li>\n<\/ul>\n

                                        Question 13.
                                        \nHow is alcohol consumption detected?
                                        \nAnswer:<\/p>\n

                                          \n
                                        • The person being tested blows through a tube, which bubbles the breath through a solution containing Sulphuric acid, Potassium dichromate, water and silver nitrate.<\/li>\n
                                        • Oxidation of alcohol results in the reduction of dichromate to chromatic ions with a change in color from orange to green.<\/li>\n<\/ul>\n

                                          \"<\/p>\n

                                          Question 14.
                                          \nWhat is Chemotherapy?
                                          \nAnswer:
                                          \nTreatment of certain diseases by destroying the invading organism without damaging the cells of the host, by the use of certain organic compounds is known as chemotherapy. It is widely used for treating cancer.<\/p>\n

                                          VIII. Answer in detail :<\/span><\/p>\n

                                          Question 1.
                                          \nDraw the cell diagram of Daniel cell. Give its reactions.
                                          \nAnswer:
                                          \n\"Samacheer<\/p>\n

                                          Question 2.
                                          \nDaniel cell
                                          \nAnswer:
                                          \n\"Samacheer<\/p>\n

                                          Question 3.
                                          \nList the applications of Nanochemistry.
                                          \nAnswer:
                                          \nApplications of Nanochemistry :<\/p>\n

                                            \n
                                          • The metallic nanoparticles can be used as very active catalysts.<\/li>\n
                                          • Chemical sensors form nanoparticles and nanowires enhance the sensitivity and sensor selectivity.<\/li>\n
                                          • Nanocoatings and nanocomposites are found useful in making a variety of products such as sports equipment, bicycles, and automobiles etc.<\/li>\n
                                          • Nanotechnology is being applied in the die production of synthetic skin and implant surgery.<\/li>\n
                                          • Nanomaterials that conduct electricity are being used in electronics as minute conductors to produce circuits for microchips.<\/li>\n
                                          • Nanomaterials are used in the preparation of cosmetics, deodorants, and sunscreen lotion. They are used to improve moisturizers, without making them too oily.<\/li>\n
                                          • Nanoparticle substances are incorporated in fabrics to prevent the growth of bacteria.<\/li>\n<\/ul>\n

                                            \"<\/p>\n

                                            Question 4.
                                            \nMention the drawbacks of Nanomaterials in chemistry.
                                            \nAnswer:
                                            \nDrawbacks of nanomaterials in chemistry :<\/p>\n

                                              \n
                                            • Nanoparticles are unstable when reacting with oxygen.<\/li>\n
                                            • Their exothermic combustion with oxygen can easily cause an explosion.<\/li>\n
                                            • Because nanoparticles are highly reactive, they inherently interact with impurities as well.<\/li>\n
                                            • Nanomaterials are usually considered biologically harmful and toxic.<\/li>\n
                                            • It is difficult to synthesis, isolate and apply them.<\/li>\n
                                            • There are no hard-and-fast safe disposal policies for nanomaterials.<\/li>\n<\/ul>\n

                                              Question 5.
                                              \nAccount the role of Radioactive isotopes in Diagnosis and treatment in the Medical field?
                                              \nAnswer:
                                              \nRadioisotopes are very useful to diagnose and treat many diseases. . Some of them are given below:<\/p>\n

                                              \"Samacheer<\/p>\n

                                              \"Samacheer<\/p>\n

                                              Question 6.
                                              \nGive a comparative account of various drugs with their application and examples.
                                              \nAnswer:
                                              \n\"Samacheer<\/p>\n

                                              \"Samacheer<\/p>\n

                                              \"<\/p>\n

                                              Question 7.
                                              \nWhat are the applications of electrochemistry?
                                              \nAnswer:
                                              \nApplications of electrochemistry :<\/p>\n

                                                \n
                                              • It has been used to discover important technical processes for the production and purification of non-ferrous metals, and for the electro- synthesis of organic compounds.<\/li>\n
                                              • Electrochemistry has been used to predict whether a particular reaction will occur or not.<\/li>\n
                                              • The detection of alcohol in drunken drivers is possible through the electrochemical redox reaction of ethanol.<\/li>\n
                                              • Production of metals like aluminum and titanium from their ores involves electrochemical reactions.<\/li>\n
                                              • Diabetes blood sugar meters measure the amount of glucose in the blood through its redox potential.<\/li>\n
                                              • Lead-acid batteries, lithium-ion batteries, and fuel cells are based on electrochemical cells.<\/li>\n
                                              • A fuel cell is used to bring about the direct conversion of chemical energy into electrical energy.<\/li>\n<\/ul>\n

                                                Question 8.
                                                \nExplain very briefly about various fields of Applied Chemistry.
                                                \nAnswer:
                                                \nVarious Fields of Applied Chemistry:<\/p>\n

                                                  \n
                                                • Nanochemistry: It is a branch of nanoscience that deals with the chemical applications of nanomaterials in nanotechnology.<\/li>\n
                                                • Nanometre = 1\/1,000,000,000 metre.<\/li>\n
                                                • Pharmaceutical chemistry: It deals with the preparation of drugs and the study of the chemical composition, nature, behaviour, structure, and influence of the drug in an organism.<\/li>\n
                                                • Electrochemistry: It deals with the relation between electrical energy and chemical change.<\/li>\n
                                                • Radiochemistry: It is the study of the chemistry of radioactive and non-radioactive isotopes.<\/li>\n
                                                • Dye chemistry: It is the study of dyes.<\/li>\n
                                                • Agricultural chemistry: It deals application of chemical and biochemical knowledge to agricultural production, the processing of raw products into foods and beverages, and environmental monitoring and remediation.<\/li>\n
                                                • Food chemistry: It involves the analysis, processing, packaging, and utilization of materials.<\/li>\n
                                                • Forensic chemistry: It applies scientific principles, techniques, and methods to the investigation of crime.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

                                                  Tamilnadu State Board New Syllabus Samacheer Kalvi 9th Science Guide Pdf Chapter 16 Applied Chemistry Text Book Back Questions and Answers, Notes. Samacheer Kalvi 9th Science Solutions Chapter 16 Applied Chemistry 9th Science Guide Applied Chemistry Text Book Back Questions and Answers I. Choose the correct answer : Question 1 One Nanometre is (a) 107metre …<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-24232","post","type-post","status-publish","format-standard","hentry","category-class-9"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/posts\/24232"}],"collection":[{"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/comments?post=24232"}],"version-history":[{"count":1,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/posts\/24232\/revisions"}],"predecessor-version":[{"id":41281,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/posts\/24232\/revisions\/41281"}],"wp:attachment":[{"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/media?parent=24232"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/categories?post=24232"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/samacheerkalvi.guide\/wp-json\/wp\/v2\/tags?post=24232"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}