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MCQs

Total Questions : 1041 | Page 4 of 105 pages
Question 31. 5-10-5 fertilisers mean that they contain
  1.    5, 10, 5% respectively of N₂, P₂O₅ and K₂O
  2.    Only 5 to 10% active fertiliser constituents
  3.    5 to 10% filler & carrier of soil conditioners
  4.    None of these
 Discuss Question
Answer: Option A. -> 5, 10, 5% respectively of N₂, P₂O₅ and K₂O
Question 32. Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N₂ & H₂ is high. The presence of promoter along with the catalyst helps in __________ of the catalyst.
  1.    Stabilisation
  2.    Increasing the effectiveness
  3.    Improving the strength & heat resistance
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 33. Maximum nitrogen percentage is in
  1.    Ammonium sulphate
  2.    Calcium ammonium nitrate
  3.    Urea
  4.    Liquid ammonia
 Discuss Question
Answer: Option D. -> Liquid ammonia
Question 34. 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
 Discuss Question
Answer: Option C. -> Absence of air
Question 35. Low grade phosphate rock can be used in electrical furnace, because
  1.    Of the better CaO/SiO₂ balance for slag formation
  2.    CaO content is less
  3.    It is cheap
  4.    It produces low cost product
 Discuss Question
Answer: Option A. -> Of the better CaO/SiO₂ balance for slag formation
Question 36. Catalyst used in the oxidation of ammonia is
  1.    Platinum-beryllium
  2.    Platinum-rhodium
  3.    Cobalt-molybdenum
  4.    Platinum-molybdenum
 Discuss Question
Answer: Option B. -> Platinum-rhodium
Question 37. An increase in the NH₃/CO₂ ratio in urea manufacture results in
  1.    Increased degree of conversion of CO₂ to urea
  2.    Decreased degree of conversion of NH₃ to urea
  3.    Decreased yield of urea
  4.    Decreased specific volume of molten mass
 Discuss Question
Answer: Option A. -> Increased degree of conversion of CO₂ to urea
Question 38. Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of
  1.    Phosphoric acid
  2.    Superphosphate
  3.    Phosphorous
  4.    Triple superphosphate
 Discuss Question
Answer: Option C. -> Phosphorous
Question 39. Steam reforming of naphtha produces ammonia synthesis gas. This is a/an __________ process.
  1.    Autocatalytic
  2.    Endothermic
  3.    Exothermic
  4.    Non-catalytic
 Discuss Question
Answer: Option B. -> Endothermic
Question 40. Monte catini process is used for the manufacture of
  1.    Nitric acid
  2.    Phosphoric acid
  3.    Urea
  4.    Calcium ammonium nitrate (CAN)
 Discuss Question
Answer: Option C. -> Urea

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