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6. Ammonium sulphate fertiliser is
a. the highest concentration nitrogenous fertiliser.
b. the best fertiliser for paddy.
c. a basic fertiliser.
d. a neutral fertiliser.
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Answer: (b).the best fertiliser for paddy.

7. Lower temperature and large excess of ammonia in urea melt
a. increases biuret formation
b. decreases biuret formation
c. is undersirable
d. does not effect biuret formation
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Answer: (b).decreases biuret formation

8. Superphosphate is manufactured by reacting phosphate rock with
a. acetic acid
b. sulphuric acid
c. aluminium chloride
d. none of these
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Answer: (b).sulphuric acid

9. Vetrocoke solution is
a. a mixture of K₂CO₃ and As₂O₃.
b. K₂SO₄.
c. a mixture of Na₂CO₃ and As₂O₃.
d. Na₂SO₄.
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Answer: (a).a mixture of K₂CO₃ and As₂O₃.

10. In calcium ammonium nitrate (CAN) fertil-ser
a. nitrate nitrogen is quick acting
b. ammoniacal nitrogen is quick acting
c. nitrate nitrogen is slower acting
d. none of these
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Answer: (a).nitrate nitrogen is quick acting

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