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Chemical Process - Section-15
  1. Temporary hardness of water can be removed by

    2. A.

     Addition of alum (a coagulant)
    B.

     Boiling
    C.

     Filtration (through gravity sand filter)
    D.

     Addition of lime

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  2. Permanent hardness of water can be removed by

    3. A.

     Simply boiling
    B.

     Adding alum
    C.

     Passing it through cation & anion exchangers
    D.

     All of the above

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  3. Permanent hardness of water can be removed by

    4. A.

     Boiling
    B.

     Adding Ca(OH)₂
    C.

     Boiling it with Na₂CO₃
    D.

     None of these

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  4. Permanent hardness of water can be removed by

    5. A.

     Addition of soda ash to it
    B.

     Treating it with zeolites
    C.

     Passing it through sodium hexametaphosphate
    D.

     All of the above

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  5. Esterification reaction

    6. A.

     Produces soap
    B.

     Is reversible
    C.

     Is a reaction between an alcohol and an organic acid
    D.

     All of the above

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  6. Polymethyl methacrylate (PMMA) is known as

    7. A.

     Bakelite
    B.

     Teflon
    C.

     Perspex
    D.

     Nylon-6

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  7. The process used for the manufacture of ethyl alcohol from molasses is

    8. A.

     Distillation
    B.

     Dehydration
    C.

     Dehydrogenation
    D.

     None of these

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  8. Raw materials required for the manufacture of __________ is acetylene and hydrochloric acid.

    9. A.

     Phthalic anhydride
    B.

     Vinyl chloride
    C.

     Maleic anhydride
    D.

     Dacron

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  9. Thermal pyrolysis of ethylene dichloride produces

    10. A.

     Trichloroethylene
    B.

     Vinyl chloride
    C.

     Ethanol amine
    D.

     Ethylene oxide

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  10. Concentration of hydrogen peroxide is done by

    11. A.

     Crystallisation
    B.

     Vacuum crystallisation
    C.

     Atmospheric distillation
    D.

     Dehydration

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