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11. Reaction of dilute sulphuric acid with phosphate rock produces
a. phosphoric acid
b. superphosphate
c. triple superphosphate
d. gypsum
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Answer: (a).phosphoric acid

12. Phosphoric acid is produced in wet process from phosphate rock and
a. dilute H₂SO₄
b. concentrated H₂SO₄
c. concentrated NHO₃
d. concentrated HCl
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Answer: (a).dilute H₂SO₄

13. Base suspension fertiliser essentially contains
a. 13% N₂ and 43% P₂O₅
b. 43% N₂ and 13% P₂O₅
c. 43% N₂ and 13% K₂O
d. 43% K₂O and 43% P₂O₅
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Answer: (a).13% N₂ and 43% P₂O₅

14. Conditioners like finely divided peat are added to the fertiliser to
a. counteract burning.
b. avoid caking & hardening.
c. produce bulk.
d. increase its solubility.
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Answer: (b).avoid caking & hardening.

15. Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
a. its N₂ content is very low.
b. it is very costly.
c. it will evaporate on spraying.
d. it is not available.
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Answer: (c).it will evaporate on spraying.

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