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Chemical Engineering :: Fertiliser Technology

  1. CaH₄(PO₄)₂ is the chemical formula of

  2. A.

     Superphosphate

    B.

     Triple superphosphate

    C.

     Calcium phosphate

    D.

     Meta phosphoric acid

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  3. Pick out the wrong statement.

  4. A.

     Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence the plant roots penetrate with difficulty

    B.

     Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis

    C.

     Application of large excess of potassic fertiliser in soil increases the valuable carotene in fruits and vegetables

    D.

     Cereal crops grown on alkaline soil absorb higher amount of flourides thereby spreading flourosis

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  5. Dehydration of ammonium carbamate to yield urea is a/an __________ reaction.

  6. A.

     Exothermic

    B.

     Endothermic

    C.

     Autocatalytic

    D.

     Catalytic

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  7. Nitrogen content of urea is about __________ percent.

  8. A.

     10

    B.

     46

    C.

     80

    D.

     94

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  9. Leaching of phosphate rock by strong __________ acid produces phosphoric acid.

  10. A.

     Sulphuric

    B.

     Hydrochloric

    C.

     Either A or B

    D.

     Neither A nor B

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  11. Ammonia synthesis reaction is

  12. A.

     Exothermic

    B.

     Endothermic

    C.

     Autocatalytic

    D.

     None of these

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  13. Ammonium nitrate is

  14. A.

     Having about 40% N₂

    B.

     Not hygroscopic

    C.

     Not prone to explosive thermal decomposition

    D.

     Mixed with limestone powder to reduce its explosive nature before using it as a fertilizer

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  15. Fertiliser plants get their N₂ requirements

  16. A.

     By fractionation of liquified air

    B.

     By dissociating oxides of nitrogen

    C.

     From coal gas (coke oven gas)

    D.

     From producer gas

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  17. Electric process as compared to wet process (for the manufacture of phosphoric acid)

  18. A.

     Can use only high grade phosphate rock

    B.

     Is used less frequently

    C.

     Produces a valuable by-product called gypsum

    D.

     Is weak acid process

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  19. Conditioners like finely divided peat are added to the fertiliser to

  20. A.

     Counteract burning

    B.

     Avoid caking & hardening

    C.

     Produce bulk

    D.

     Increase its solubility

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