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MCQs

Total Questions : 1041 | Page 8 of 105 pages
Question 71. Heating of orthophosphoric acid to about 900°C, produces
  1.    Metaphosphoric acid
  2.    Pyrophosphoric acid
  3.    No change in it
  4.    None of these
 Discuss Question
Answer: Option A. -> Metaphosphoric acid
Question 72. A potassic fertiliser contains 50% K₂O. It could be
  1.    Potassium sulphate
  2.    Potassium chloride
  3.    A mixture of NaCl+ KCl
  4.    None of these
 Discuss Question
Answer: Option A. -> Potassium sulphate
Question 73. Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
  1.    Its N₂ content is very low
  2.    It is very costly
  3.    It will evaporate on spraying
  4.    It is not available
 Discuss Question
Answer: Option C. -> It will evaporate on spraying
Question 74. Multistage operation (as in the case of catalytic oxidation of SO₂) is not carried out for NH₃ synthesis, because of
  1.    Comparatively higher pressure drop
  2.    High cost of the high pressure vessel used for the reactor
  3.    Higher pumping cost
  4.    Chances of entrainment and disturbance of catalyst bed
 Discuss Question
Answer: Option B. -> High cost of the high pressure vessel used for the reactor
Question 75. Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils?
  1.    Urea
  2.    CAN
  3.    Ammonium sulphate
  4.    Calcium cyanamide
 Discuss Question
Answer: Option D. -> Calcium cyanamide
Question 76. 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
 Discuss Question
Answer: Option A. -> Its activity declines rapidly, if heated to above 520°C
Question 77. Nitrogen content in ammonium sulphate (a fertiliser) is around __________ percent.
  1.    5
  2.    20
  3.    50
  4.    65
 Discuss Question
Answer: Option B. -> 20
Question 78. Which of the following fertilisers contains the least percentage of nitrogen?
  1.    Liquid ammonia
  2.    Urea
  3.    Ammonium phosphate
  4.    Ammonium sulphate
 Discuss Question
Answer: Option C. -> Ammonium phosphate
Question 79. Conversion achieved in HNO₃ synthesis with the use of platinum catalyst is about 95-97%. The rate of formation of nitrogen dioxide from the oxidation of nitric acid is favoured by
  1.    Decreasing the pressure
  2.    Decreasing the temperature
  3.    Increasing the temperature
  4.    None of these
 Discuss Question
Answer: Option C. -> Increasing the temperature
Question 80. Reaction of anhydrous liquid ammonia with orthophosphoric acid produces
  1.    Ammonium phosphate
  2.    Superphosphate
  3.    Triple superphosphate
  4.    None of these
 Discuss Question
Answer: Option A. -> Ammonium phosphate

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