Chemistry PYQs

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1. Prelims 1999Q124Chemistry

   Which one of the following types of coal contains a higher percentage of carbon than the rest?

   aBituminous coalbLignitecPeatdAnthracite
2. Prelims 1999Q127Chemistry

   Consider the following statements:

   I.Glass can be etched or scratched by diamond.

   II.Glass can be etched or scratched by hydrofluoric acid.

   III.Glass can be etched or scratched by aqua regia.

   IV.Glass can be etched or scratched by concentrated sulphuric acid.

   Which of these statements are correct?

   aI and IVbII and IIIcI and IIdII and IV
3. Prelims 1999Q128Chemistry

   Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid.

   Reason (R): Specific heat of water is quite large.

   aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is not a correct explanation of AcA is true, but R is falsedA is false, but R is true
4. Prelims 1998Q103Chemistry

   Match List I with List II and select the correct answer using the codes given below the lists:

   List I

   I.Potassium bromide

   II.Potassium nitrate

   III.Potassium sulphate

   IV.Mono-potassium tartrate

   List II

   A.Fertiliser

   B.Photography

   C.Bakery

   D.Gunpowder

   Codes:

   aI-B, II-D, III-A, IV-CbI-B, II-D, III-C, IV-AcI-D, II-B, III-C, IV-AdI-D, II-B, III-A, IV-C
5. Prelims 1998Q106Chemistry

   Consider the following statements: Coke is one of the materials of the charge added to blast furnace for the production of steel/iron. Its function is to

   I.Act as a reducing agent.

   II.Remove silica associated with the iron ore.

   III.Function as fuel, to supply heat.

   IV.Act as an oxidizing agent.

   Of these statements:

   aI and II are correctbII and IV are correctcI and III are correctdIII and IV are correct
6. Prelims 1998Q107Chemistry

   Which one of the following metals does not form amalgams?

   aZincbCoppercMagnesiumdIron
7. Prelims 1998Q113Chemistry

   Consider the following statements about acetylene:

   I.It is used in welding industry.

   II.It is raw material for preparing plastics.

   III.It is easily obtained by mixing silicon carbide and water.

   Of these statements:

   aI and II are correctbI and III are correctcII and III are correctdI, II and III are correct
8. Prelims 1998Q121Chemistry

   Which one of the following statements regarding starch and cellulose is NOT correct?

   aBoth of them are of plant originbBoth of them are polymerscBoth of them give colour with iodinedBoth of them are made up of glucose molecules
9. Prelims 1998Q126Chemistry

   Match List I with List II and select the correct answer using the codes given below the lists:

   List I

   A.Blue vitriol

   B.Epsom salt

   C.Baking soda

   D.Caustic soda

   List II

   1.Sodium bicarbonate

   2.Sodium hydroxide

   3.Magnesium sulphate

   4.Copper sulphate

   aA-3, B-4, C-2, D-1bA-4, B-3, C-1, D-2cA-3, B-4, C-1, D-2dA-4, B-1, C-2, D-1
10. Prelims 1998Q127Chemistry

    Assertion (A): Formic acid is a stronger acid than acetic acid.

    Reason (R): Formic acid is an organic acid.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is NOT a correct explanation of AcA is true, but R is falsedA is false, but R is true
11. Prelims 1998Q129Chemistry

    Assertion (A): Phenyl is used as a household germicide.

    Reason (R): Phenyl is a phenol derivative and phenol is an effective germicide.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is NOT a correct explanation of AcA is true, but R is falsedA is false, but R is true
12. Prelims 1998Q130Chemistry

    Assertion (A): Sodium metal is stored under kerosene.

    Reason (R): Metallic sodium melts when exposed to air.

    aBoth A and R are true, and R is the correct explanation of AbBoth A and R are true, but R is NOT a correct explanation of AcA is true, but R is falsedA is false, but R is true
13. Prelims 1997Q111Chemistry

    The characteristic odour of garlic is due to

    aa chloro compoundba sulphur compoundca fluorine compounddacetic acid
14. Prelims 1997Q112Chemistry

    Which one of the following is an active component of oil of clove?

    aMentholbEugenolcMethanoldBenzaldehyde
15. Prelims 1997Q113Chemistry

    The most reactive among the halogens is

    afluorinebchlorinecbrominediodine
16. Prelims 1997Q115Chemistry

    Which one of the following has the highest fuel value?

    aHydrogenbCharcoalcNatural GasdGasoline
17. Prelims 1997Q116Chemistry

    Which one of the following is used as an anti-freeze for the automobile engines?

    aPropyl alcoholbEthanolcMethanoldEthylene glycol
18. Prelims 1996Q128Chemistry

    The offending substance in the liquor tragedies leading to blindness, etc. is

    aethyl alcoholbamyl alcoholcbenzyl alcoholdmethyl alcohol
19. Prelims 1996Q129Chemistry

    Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?

    aAluminiumbChromiumcNickeldTungsten
20. Prelims 1995Q100Chemistry

    Which one of the following is a mixed fertilizer?

    aCAMbUreacAmmonium SulphatedNPK
21. Prelims 1995Q101ChemistryAnswer disputed

    Which one of the following polymers is widely used for making bullet-proof material?

    aPolyvinyl chloridebPolyamidescPolyethylenedPolycarbonates
22. Prelims 1995Q102Chemistry

    The chemical used as a ‘fixer’ in photography is

    asodium sulphatebsodium thiosulphatecammonium persulphatedborax
23. Prelims 1995Q112Chemistry

    Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torchlights, electric shavers, etc.?

    aNickel and cadmiumbZinc and carboncLead peroxide and leaddIron and cadmium