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Chemical Engineering :: Fertiliser Technology

  1. 5-10-5 fertilisers mean that they contain

  2. A.

     5, 10, 5% respectively of N₂, P₂O₅ and K₂O

    B.

     Only 5 to 10% active fertiliser constituents

    C.

     5 to 10% filler & carrier of soil conditioners

    D.

     None of these

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  3. Maximum nitrogen percentage is in

  4. A.

     Ammonium sulphate

    B.

     Calcium ammonium nitrate

    C.

     Urea

    D.

     Liquid ammonia

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  5. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.

  6. A.

     Stabilisation

    B.

     Increasing the effectiveness

    C.

     Improving the strength & heat resistance

    D.

     All of the above

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  7. Low grade phosphate rock can be used in electrical furnace, because

  8. A.

     Of the better CaO/SiO₂ balance for slag formation

    B.

     CaO content is less

    C.

     It is cheap

    D.

     It produces low cost product

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  9. Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

  10. A.

     Presence of an inert atmosphere

    B.

     Presence of a reducing atmosphere

    C.

     Absence of air

    D.

     Presence of an oxidising atmosphere

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  11. Catalyst used in the oxidation of ammonia is

  12. A.

     Platinum-beryllium

    B.

     Platinum-rhodium

    C.

     Cobalt-molybdenum

    D.

     Platinum-molybdenum

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  13. An increase in the NH₃/CO₂ ratio in urea manufacture results in

  14. A.

     Increased degree of conversion of CO₂ to urea

    B.

     Decreased degree of conversion of NH₃ to urea

    C.

     Decreased yield of urea

    D.

     Decreased specific volume of molten mass

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  15. Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of

  16. A.

     Phosphoric acid

    B.

     Superphosphate

    C.

     Phosphorous

    D.

     Triple superphosphate

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  17. Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process.

  18. A.

     Autocatalytic

    B.

     Endothermic

    C.

     Exothermic

    D.

     Non-catalytic

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  19. Monte catini process is used for the manufacture of

  20. A.

     Nitric acid

    B.

     Phosphoric acid

    C.

     Urea

    D.

     Calcium ammonium nitrate (CAN)

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