Fertiliser Technology - Chemical Engineering Questions and Answers

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Plant tranquillisers

hold back stem growth and halt plants at a desired height.

cause early maturation of plants.

accelerate ripening of food and grain.

produce seedless fruit.

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Dehydration of ammonium carbamate to yield urea is a/an __________ reaction.

exothermic

endothermic

autocatalytic

catalytic

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Triple superphosphate which contains about 46% P₂O₅ is produced by the reaction of phosphate rock with ortho phosphoric acid of____percent concentration.

25-28

52-54

75-80

> 98

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NPK means a __________ fertiliser.

mixed

potassic

liquid

solid

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Low grade phosphate rock can be used in electrical furnace, because

of the better CaO/SiO₂ balance for slag formation.

CaO content is less.

it is cheap.

it produces low cost product.

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Fertiliser produced during soda ash manufacture by dual process is ammonium

chloride

sulphate

nitrate

none of these

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In an ammonia plant, the purge off is essential to

maintain inert gas concentration within a limit.

remove excess poisonous gases.

maintain H₂ : N₂ ratio at 3 :1.

remove uncondensed ammonia vapour.

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Which of the following fertilisers is required for the development of fibrous materials of the plants and of the sugar of vegetable & fruits ?

Nitrogenous fertilisers

Phosphatic fertilisers

Potassic fertiliser

None of these

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Which of the following solvents is used for the extraction of H₃PO₄ from CaCl₂ solution during manufacture of ortho-phosphoric acid by wet process employing hydrochloric acid leaching?

Iso propyl alcohol

Butyl alcohol

Toluene

Hexane