Fertiliser Technology

81.Hydrogen is recovered from coke oven gas on commercial scale (as practised in fertiliser plant at Rourkela) by

  1. Adsorption on palladium
  2. Cryogenic operations (low temperature cooling)
  3. Absorption (using ethanolamine or pyrogallol solution)
  4. None of these
Correct answer: (B)
Cryogenic operations (low temperature cooling)

82.In _________ converter for ammonia synthesis, the catalyst is arranged in the form of a single continuous bed.

  1. Fauser-Montecatini
  2. Claude
  3. Uhde
  4. Kellogg
Correct answer: (B)
Claude

83.In ammonia synthesis (N4 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at

  1. Low pressure
  2. High pressure
  3. Very high temperature
  4. Atmospheric pressure; as the pressure has no effect on conversion
Correct answer: (B)
High pressure

84.In an ammonia plant, the purge off is essential to

  1. Maintain inert gas concentration within a limit
  2. Remove excess poisonous gases
  3. Maintain H2 : N4 ratio at 3 :1
  4. Remove uncondensed ammonia vapour
Correct answer: (C)

Maintain H2 : N4 ratio at 3 :1

85.In calcium ammonium nitrate (CAN) fertiliser

  1. Nitrate nitrogen is quick acting
  2. Ammoniacal nitrogen is quick acting
  3. Nitrate nitrogen is slower acting
  4. None of these
Correct answer: (A)
Nitrate nitrogen is quick acting

86.In natural gas, the C/H ratio (by weight) varies in the range of

  1. 43924
  2. 44112
  3. 15-17
  4. 20-25
Correct answer: (A)
43924

87.In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process

  1. Uses lower grade phosphate rock
  2. Requires lower capital investment in the plant
  3. Produces lower purity acid
  4. Is very costly
Correct answer: (C)
Is very costly

88.In the manufacture of ortho-phosphoric acid by strong H2SO4 leaching wet process, keeping the reactor temperature above 100°C, results in the formation of undesirable

  1. CaSO4 .½ H2O and CaSO4 crystals
  2. Pyrophosphoric acid
  3. Meta-phosphoric acid
  4. All (A), (B) and (C)
Correct answer: (A)

CaSO4 .½ H2O and CaSO4 crystals

89.In the manufacture of urea, the intermediate chemical formed is

  1. Biuret
  2. Ammonium carbamate
  3. Ammonium carbonate
  4. None of these
Correct answer: (B)
Ammonium carbamate

90.Iron is not used alone as a catalyst in ammonia synthesis, because

  1. Its activity declines rapidly, if heated to above 520°C
  2. It decomposes ammonia
  3. It gets oxidised above 500°C
  4. None of these
Correct answer: (A)
Its activity declines rapidly, if heated to above 520°C
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