Lakshya Education MCQs

Question: Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air.
Options:
A.50-80
B.250-400
C.1000-1200
D.800-900
Answer: Option B

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Question 1. I argest capacity nitrogenous fertiliser plants (2700 tons of NH₃ per day) (2 Nos) in India are located at
  1.    Thal-Vaishet (under RCF in Maharashtra) and Hazira (under IFFCO in Gujarat)
  2.    Talchar (Orissa) and Ramagundam (A.P.) both under FCI
  3.    Korba (M.P.) and Talchar (Orissa) both under FCI
  4.    Haldia (W.B) and Namrup (Assam) both under HFC
Answer: Option A
Question 2. CaH₄(PO₄)₂ is the chemical formula of
  1.    Superphosphate
  2.    Triple superphosphate
  3.    Calcium phosphate
  4.    Meta phosphoric acid
Answer: Option B
Question 3. Pick out the wrong statement.
  1.    Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence the plant roots penetrate with difficulty
  2.    Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis
  3.    Application of large excess of potassic fertiliser in soil increases the valuable carotene in fruits and vegetables
  4.    Cereal crops grown on alkaline soil absorb higher amount of flourides thereby spreading flourosis
Answer: Option C
Question 4. __________ is not a fertiliser.
  1.    Calcium ammonium nitrate
  2.    Ferrous sulphate
  3.    Liquid ammonia
  4.    Ammonium sulphate
Answer: Option B
Question 5. Formation of ammonium carbamate by reaction of NH₃ with CO₂ is a/an __________ reaction.
  1.    Catalytic
  2.    Exothermic
  3.    Endothermic
  4.    Reversible
Answer: Option B
Question 6. Yield of urea can be increased with excess ammonia and higher pressure & temperature, but because of __________ this is normally not done.
  1.    Increased biuret formation
  2.    High corrosion rate
  3.    Increased cost of equipment
  4.    All of the above
Answer: Option D

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