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Chemical Engineering :: Fertiliser Technology

  1. Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

  2. A.

     Phosphoric acid

    B.

     Ammonium phosphate

    C.

     Phosphorous

    D.

     Superphosphate

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  3. In the manufacture of orthophosphoric acid by strong H₂SO₄ leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesriable

  4. A.

     CaSO₄ .½H₂O and CaSO₄ crystals

    B.

     Pyrophosphoric acid

    C.

     Metaphosphoric acid

    D.

     All of the above

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  5. Which of the following is a natural inorganic fertiliser?

  6. A.

     Chile salt petre

    B.

     Oilcake

    C.

     Gobar mannure

    D.

     None of these

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  7. Which of the following solvents is used for the extraction of H₃PO₄ from CaCl₂ solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?

  8. A.

     Iso propyl alcohol

    B.

     Butyl alcohol

    C.

     Toluene

    D.

     Hexane

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  9. Which of the following is not a mixed fertiliser?

  10. A.

     Nitrophosphate

    B.

     Calcium ammonium nitrate (CAN)

    C.

     Ammonium phosphate

    D.

     None of these

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  11. Red phosphorous is changed into white phosphorous by

  12. A.

     Heating in presence of light

    B.

     Melting under pressure

    C.

     Vaporisation followed by condensation

    D.

     None of these

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  13. Which nutrient in fertiliser makes the plant stems stronger and increases branching?

  14. A.

     Nitrogen

    B.

     Phosphorous

    C.

     Potassium

    D.

     Calcium

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  15. Nitrolime is

  16. A.

     Calcium nitrate

    B.

     Calcium ammonium nitrate

    C.

     A mixture of nitric acid and lime

    D.

     A mixture of ammonium nitrate and calcium nitrate

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  17. Potassic fertilisers do not promote the development of

  18. A.

     Stems & leaves during early stage of plant growth

    B.

     Starches of potatoes & grains

    C.

     Sugar of fruits & vegetables

    D.

     Fibrous materials of plants

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  19. H₄P₂O₇ is the chemical formula of __________ phosphoric acid.

  20. A.

     Pyro

    B.

     Ortho

    C.

     Meta

    D.

     None of these

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