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Chemical Process - Section-15
  1. Main product in calcium carbide-water reaction is

    2. A.

     Ca(OH)₂
    B.

     C₂H₂
    C.

     CO₂
    D.

     CaCO₃

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  2. CaCl(OCl) is the chemical formula of

    3. A.

     Hypo
    B.

     Bleaching powder
    C.

     Plaster of paris
    D.

     Aqua regia

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  3. Carboxymethyl cellulose (CMC) is added in detergents to

    4. A.

     Prevent redeposition of soil on cleaned surface
    B.

     Act as optical brightening agent
    C.

     Inhibit corrosion in washing machines made of aluminium
    D.

     None of these

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  4. Which of the following is used as a coagulant in water treatment?

    5. A.

     Chloramine
    B.

     Chlorine
    C.

     Ferrous sulphate
    D.

     Hydrogen peroxide

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  5. Coal tar is used as a

    6. A.

     Binding material for coal briquettes
    B.

     Fuel in rotary kiln
    C.

     Binder in making carbon electrodes
    D.

     All of the above

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  6. The process involved in converting rubber into a thin sheet or coating it on fabric is called

    7. A.

     Extrusion
    B.

     Mastication
    C.

     Calendering
    D.

     Valcanisation

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  7. Raw material used in alcohol distilleries in India is

    8. A.

     Molasses
    B.

     Benzol
    C.

     Methylated spirit
    D.

     None of these

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  8. Fermentation of molasses to produce ethyl alcohol is done at __________ °C

    9. A.

     20 - 30
    B.

     < - 5
    C.

     100 - 150
    D.

     250 - 300

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  9. The end bleaching agent used to move last traces of colour bodies from the pulp is

    10. A.

     Chlorine dioxide (ClO₂)
    B.

     MgO
    C.

     SO₂ gas
    D.

     Mercaptans

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  10. Styrene-butadiene-rubber (SBR) as compared to natural rubber has

    11. A.

     Poorer tensile strength
    B.

     Poorer resistance to oxidation
    C.

     Greater amount of heat build-up under heavy loading
    D.

     All of the above

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