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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


  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


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

  6. A.

     Chile salt petre

    B.

     Oilcake

    C.

     Gobar mannure

    D.

     None of these


  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


  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


  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


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

  14. A.

     Nitrogen

    B.

     Phosphorous

    C.

     Potassium

    D.

     Calcium


  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


  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


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

  20. A.

     Pyro

    B.

     Ortho

    C.

     Meta

    D.

     None of these