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41. Catalyst used in the manufacture of NH₃ by Haber's process is finely divided
a. nickel
b. iron
c. vanadium pentoxide
d. alumina
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Answer: (b).iron

42. Red phosphorous is changed into white phosphorous by
a. heating in presence of light.
b. melting under pressure.
c. vaporisation followed by condensation.
d. none of these.
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Answer: (c).vaporisation followed by condensation.

43. Urea is represented as
a. NH₂.CO.NH₂
b. NH₃CO.CH₃
c. NH.CO₂.NH
d. NH₃.CO₂.NH₃
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Answer: (a).NH₂.CO.NH₂

44. Two gas based fertiliser plants are located in
a. Maharashtra and Gujarat
b. Maharashtra and Orissa
c. Gujarat and Madhya Pradesh
d. Jharkhand and Chattisgarh
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Answer: (a).Maharashtra and Gujarat

45. Fertiliser plants get their N₂ requirements
a. by fractionation of liquified air.
b. by dissociating oxides of nitrogen.
c. from coal gas (coke oven gas).
d. from producer gas.
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Answer: (a).by fractionation of liquified air.