Chemical Engineering - Fertiliser Technology

36. 

Leaching of phosphate rock by strong __________ acid produces phosphoric acid.

A. sulphuric
B. hydrochloric
C. either (a) or (b)
D. neither (a) nor (b)

Answer: Option C

Explanation:

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37. 

In natural gas, the C/H ratio (by weight) varies in the range of

A. 3-4
B. 8-10
C. 15-17
D. 20-25

Answer: Option A

Explanation:

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38. 

Which of the following fertilisers is needed for promoting the development of leaves and stems during early stages of plant growth ?

A. Nitrogeneous fertiliser
B. Potassic fertiliser
C. Phosphatic fertiliser
D. None of these

Answer: Option A

Explanation:

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39. 

Which of the following set of conditions is favourable for the maximum yield of ammonia by Haber's process ?

A. High pressure, low reactants concentration, high temperature.
B. High pressure, low reactants concentration, low temperature.
C. High pressure, high reactants concentration, low temperature.
D. Low pressure, high reactants concentration, low temperature.

Answer: Option C

Explanation:

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40. 

Prilling of urea should be accomplished (in a sprayer) just above the melting point of urea with minimum of retention time, otherwise it will result in

A. low bulk density product
B. biuret formation
C. non-spherical prills
D. substantially wet non-flowing and sticky product

Answer: Option B

Explanation:

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