Fertiliser Technology

Question: P2O5 percentage in the phosphoric acid produced by wet process is about
[A].

10

[B].

30

[C].

50

[D].

70

Answer: Option B

Explanation:

No answer description available for this question.

Question: Heating of coke, sand & phosphate rock in an electric furnace is done for the manufacture of
[A].

phosphoric acid.

[B].

superphosphate.

[C].

phosphorous.

[D].

triple superphosphate.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A fertiliser plant is classified as a gas based fertiliser plant, when it uses __________ gas as a source of hydrogen for the manufacture of ammonia.
[A].

coke oven

[B].

producer

[C].

natural

[D].

coal

Answer: Option C

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Bio-fertilisers are cheaper, renewable and pollution free. They improve the __________ of the soil.
[A].

nutrient supply

[B].

texture

[C].

water holding capacity

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Liquid ammonia is not used as such a fertiliser in tropical countries like India, because
[A].

its N2 content is very low.

[B].

it is very costly.

[C].

it will evaporate on spraying.

[D].

it is not available.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the
[A].

presence of an inert atmosphere.

[B].

presence of a reducing atmosphere.

[C].

absence of air.

[D].

presence of an oxidising atmosphere.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Commercial fertilisers are available mostly in the form of
[A].

powder

[B].

grannules

[C].

lumps

[D].

flakes

Answer: Option B

Explanation:

No answer description available for this question.

Question: A mixture of phosphate rock __________ is heated in an electric furnace to produce phosphorous.
[A].

salt & coke

[B].

sand & coke

[C].

and coke

[D].

and sand

Answer: Option B

Explanation:

No answer description available for this question.

Question: Main component of bone ash is
[A].

calcium sulphate

[B].

calcium phosphate

[C].

calcium carbonate

[D].

sodium phosphate

Answer: Option B

Explanation:

No answer description available for this question.