Fertiliser Technology - Chemical Engineering Questions and Answers

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Which of the following fertilisers is used as a cattle feed?

Urea

Calcium ammonium nitrate

Superphosphate

Ammonium sulphate

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Biuret formation in urea is kept at minimum (< 1 %), because it is

corrosive in nature.

toxic and harmful to some crops.

helpful in decomposition of urea.

explosive in nature.

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Catalyst used in desulphurisation of naphtha is

Co-Mo

Pt-Rh

silica gel

nickel

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Pick out the correct statement.

Reaction of NH₃ with HNO₃ to produce (NH₄)₂NO₃ is endothermic.

With increase in NH₃/CO₂ ratio, urea yield decreases for a given temperature, pressure and total feed rate.

Biuret (an intermediate during urea manufacture) is toxic to seeds and animals.

both (b) and (c).

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A phosphatic fertiliser contains 16% P₂O₅. It could be

dicalcium phosphate

superphosphate

triple superphosphate

none of these

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__________ is not a fertiliser.

Calcium ammonium nitrate

Ferrous sulphate

Liquid ammonia

Ammonium sulphate

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__________ is the undesirable by-product produced in the manufacture of urea.

Ammonium carbonate

Biuret

Carbon dioxide

Ammonium carbamate

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Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at __________ °C.

250-300

500-750

950-1050

1400-1450

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Which is the best fertiliser for paddy ?

Ammonium sulphate

Nitro-phosphate

Superphosphate

Potassium nitrate