Fertiliser Technology - Chemical Engineering Questions and Answers

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Reaction of orthophosphoric acid with soda ash produces

sodium tripolyphosphate (STPP)

tricresyl phosphate

tributyl phosphate

nitrophosphate

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Urea is formed only

in liquid phase

in vapour phase

at very high temperature

at very low pressure (vacuum)

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Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

reversible

catalytic

exothermic

endothermic

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Electric process as compared to wet process (for the manufacture of phosphoric acid)

can use only high grade phosphate rock.

is used less frequently.

produces a valuable by-product called gypsum.

is weak acid process.

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Ammonium sulphate can be produced by reacting gypsum with

ammonia

ammonium carbonate

nitric acid

none of these

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Nitrogenous fertiliser is required

during the early stage of growth to promote development of stem and leaves.

for accelerating fruit formation in later stage of growth.

to lessen the effect of excessive potash application.

none of these.

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Fertiliser plant making ammonium sulphate employing gypsum-ammonia reaction (usual practice is to use ammonia and sulphuric acid) is located at

Rourkela (under SAIL)

Bokaro (under SAIL)

Sindri (under FCI)

Baroda (under G.S.F.C.)

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Catalyst used in Haber's process for ammonia production is

reduced iron oxide

nickel

vanadium pentoxide

silica gel

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Sodium tri poly phosphate (STPP) is manufactured by reaction of phosphoric acid with sodium

carbonate

phosphate

bicarbonate

silicate