Chemical Engineering - Fertiliser Technology

46. 

Yield of elemental phosphorous from rock phosphate is about __________ percent.

A. 1-2
B. 15-25
C. 40-45
D. 60-65

Answer: Option B

Explanation:

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47. 

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

A. decreasing the pressure.
B. decreasing the temperature.
C. increasing the temperature.
D. none of these.

Answer: Option C

Explanation:

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48. 

Liquid ammonia and 60% nitric acid reaction (which produces ammonium nitrate) is

A. exothermic
B. endothermic
C. autocatalytic
D. none of these

Answer: Option A

Explanation:

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49. 

Pick out the wrong statement.

A. Loamy soil is the best soil for vigorous plant growth, while the clayey soil is solid and hence the plant roots penetrate with difficulty.
B. Large excess use of nitrogenous fertiliser in land causes the problem of diarrhoea and cyanosis.
C. Application of large excess of potassic fertiliser in soil increases the valuable carotene in fruits and vegetables.
D. Cereal crops grown on alkaline soil absorb higher amount of flourides thereby spreading flourosis.

Answer: Option C

Explanation:

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50. 

Raw materials required for the production of CAN (Calcium ammonium nitrate) is NH3

A. HNO3 & limestone
B. CO2 & H2SO4
C. HNO3 & NH4Cl
D. CO2 & KNO3

Answer: Option A

Explanation:

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