Question 31 : Electric process as compared to wet process (for the manufacture of phosphoric acid)
1. is weak acid process.
2. is used less frequently.
3. produces a valuable by-product called gypsum.
4. can use only high grade phosphate rock.
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Question 32 : Heating of orthophosphoric acid to 250°C produces
1. none of these
2. metaphosphoric acid
3. pyrophosphoric acid
4. no change in it
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Question 33 : Urea is formed only
1. at very high temperature
2. at very low pressure (vacuum)
3. in liquid phase
4. in vapour phase
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Question 34 : Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.
1. exothermic
2. reversible
3. catalytic
4. endothermic
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Question 35 : Prilling tower is found in the flowsheet for the manufacture of
1. superphosphate
2. ammonia
3. urea
4. triple superphosphate
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Question 36 : Catalyst used in Haber's process for ammonia production is
1. vanadium pentoxide
2. reduced iron oxide
3. nickel
4. silica gel
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Question 37 : Reaction of orthophosphoric acid with soda ash produces
1. tricresyl phosphate
2. sodium tripolyphosphate (STPP)
3. tributyl phosphate
4. nitrophosphate
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Question 38 : Vapor phase reaction of ammonia & nitric acid to produce ammonium nitrate is termed as the __________ process.
1. Du-pont's
2. Haber's
3. Le-chatlier's
4. Stengel
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Question 39 : In calcium ammonium nitrate (CAN) fertil-ser
1. nitrate nitrogen is slower acting
2. none of these
3. ammoniacal nitrogen is quick acting
4. nitrate nitrogen is quick acting
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Question 40 : Rock phosphate constitutes mainly of
1. fluorapatite
2. di-ammonium phosphate
3. mono-calcium phosphate
4. di-calcium phosphate
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