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36. During conversion of ammonium carbamate into urea, presence of large excess of water
a. increases the yield of urea.
b. adversely affects the yield of urea.
c. reduces the evaporator load by diluting the urea solution.
d. does not affect the yield of urea.
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Answer: (b).adversely affects the yield of urea.

37. Hydrogen content of coke oven gas is __________ percent.
a. 4
b. 22
c. 58
d. 84
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Answer: (c).58

38. Pick out the wrong statement.
a. 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid.
b. Chemically unreactive nature of red phosphorous is due to its polymeric structure.
c. Red phosphorous is the most reactive allotropic form of phosphorous.
d. Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation.
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Answer: (c).Red phosphorous is the most reactive allotropic form of phosphorous.

39. Ammonium nitrate (a fertiliser) is coated with limestone powder to
a. increase its nitrogen content.
b. cut down its production cost.
c. avoid the risk of explosion.
d. add extra nutrient as fertiliser.
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Answer: (c).avoid the risk of explosion.

40. Action of phosphoric acid on rock phosphate produces
a. superphosphate
b. triple superphosphate
c. nitrophosphate
d. diammonium phosphate
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Answer: (b).triple superphosphate