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MCQs

Total Questions : 1041 | Page 16 of 105 pages
Question 151. Both white phosphorous as well as red phosphorous
  1.    Are soluble in CS₂
  2.    Burns when heated in air
  3.    Reacts with hot caustic soda solution to give phosphine
  4.    All of the above
 Discuss Question
Answer: Option B. -> Burns when heated in air
Question 152. C/H ratio (by weight) of naphtha used in nitrogenous fertiliser making is about
  1.    2
  2.    6
  3.    13
  4.    20
 Discuss Question
Answer: Option B. -> 6
Question 153. Prilling tower is found in the flowsheet for the manufacture of
  1.    Ammonia
  2.    Urea
  3.    Superphosphate
  4.    Triple superphosphate
 Discuss Question
Answer: Option B. -> Urea
Question 154. The most suitable fertiliser for accelerating seeding or fruit formation in later stages of plant growth is __________ fertiliser.
  1.    Nitrogenous
  2.    Phosphatic
  3.    Potassic
  4.    None of these
 Discuss Question
Answer: Option B. -> Phosphatic
Question 155. Oxidation of ammonia is
  1.    Exothermic
  2.    Endothermic
  3.    Non-catalytic
  4.    Autocatalytic
 Discuss Question
Answer: Option A. -> Exothermic
Question 156. Phosphatic fertilisers
  1.    Are useful during early stage of the plant growth
  2.    Accelerate fruit formation in later stages of growth
  3.    Lessen the effect of excessive nitrogen application
  4.    None of these
 Discuss Question
Answer: Option B. -> Accelerate fruit formation in later stages of growth
Question 157. Phosphorus vapour comprises of
  1.    P
  2.    P₂
  3.    P₃
  4.    P₄
 Discuss Question
Answer: Option D. -> P₄
Question 158. Pick out the wrong statement.
  1.    Nitrogen is normally supplied in fertiliser either in ammoniacal or the nitrate form, from which the soil takes it up in the form of ammonium ions or nitrate ions and forms amino acids
  2.    Calcium present in the fertiliser helps in correcting the soil acidity
  3.    Particle size range of a good grannular fertiliser is 10-15 mesh and it contains less moisture as compared to finely divided powder form of fertiliser
  4.    Ammonium nitrate fertiliser is obtained as a by-product in an integrated steel plant having by-product coke ovens
 Discuss Question
Answer: Option D. -> Ammonium nitrate fertiliser is obtained as a by-product in an integrated steel plant having by-product coke ovens
Question 159. (CH₃ C₆ H₄)₃ PO₄ is the chemical formula of
  1.    Triple superphosphate
  2.    Tricresyl phosphate
  3.    Flourapatite
  4.    Superphosphate
 Discuss Question
Answer: Option B. -> Tricresyl phosphate
Question 160. Plant tranquillisers
  1.    Hold back stem growth and halt plants at a desired height
  2.    Cause early maturation of plants
  3.    Accelerate ripening of food and grain
  4.    Produce seedless fruit
 Discuss Question
Answer: Option A. -> Hold back stem growth and halt plants at a desired height

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