Fertiliser Technology

51.Commercial production of hydrogen for the manufacture of nitrogenous fertilisers is done by

1. Steam reforming of naphtha and cracking of natural gas
2. Electrolysis of water
3. Cryogenic separation of hydrogen from coke oven gas
4. All (A), (B) and (C)

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52.Conditioners like finely divided peat are added to the fertiliser to

1. Counteract burning
2. Avoid caking&hardening
3. Produce bulk
4. Increase its solubility

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53.Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at _________ °C in absence of air.

1. 50-80
2. 250-400
3. 1000-1200
4. 800-900

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54.Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the

1. Presence of an inert atmosphere
2. Presence of a reducing atmosphere
3. Absence of air
4. Presence of an oxidising atmosphere

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55.Dehydration of ammonium carbamate (to produce urea) is a/an _________ reaction.

1. Reversible
2. Catalytic
3. Exothermic
4. Endothermic

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56.Dehydration of ammonium carbamate produces

1. Urea
2. Biuret
3. Ammonia water
4. None of these

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57.Dehydration of ammonium carbamate to yield urea is a/an _________ reaction.

1. Exothermic
2. Endothermic
3. Autocatalytic
4. Catalytic

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58.During conversion of ammonium carbamate into urea, presence of large excess of water

1. Increases the yield of urea
2. Adversely affects the yield of urea
3. Reduces the evaporator load by diluting the urea solution
4. Does not affect the yield of urea

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59.During nitric acid manufacture, catalytic oxidation of ammonia at 800°C in presence of platinum catalyst produces nitrogen oxide. Conversion of NH₃ to NO is about _________ percent.

1. 38
2. 68
3. 82
4. 98

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60.Effectiveness of a fertiliser is independent of the

1. Nature of soil
2. Type of crop
3. pH of soil
4. None of these

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