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

Action of phosphoric acid on rock phosphate produces

A

Superphosphate

B

Triple superphosphate

C

Nitrophosphate

D

Diammonium phosphate

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

A

Acidic refractory

B

Rubber

C

Karbate

D

Lead or acid-proof bricks

Phosphoric acid is produced in wet process from phosphate rock and

A

Dilute H₂SO₄

B

Concentrated H₂SO₄

C

Concentrated NHO₃

D

Concentrated HCl

Reaction of nitric acid and sulphuric acid with phosphate rock produces

A

Nitrophosphate

B

Diammonium phosphate

C

Tricresyl phosphate

D

Tributyl phosphate

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

A

Carbonate

B

Phosphate

C

Bicarbonate

D

Silicate

Reaction of __________ acid with phosphate rock produces superphosphates.

A

Hydrochloric

B

Sulphuric

C

Nitric

D

Phosphoric

Reaction of dilute sulphuric acid with phosphate rock produces

A

Phosphoric acid

B

Superphosphate

C

Triple superphosphate

D

Gypsum

Reaction of orthophosphoric acid with phosphate rock produces

A

Superphosphate

B

Triple superphosphate

C

Metaphosphoric acid

D

Monoammonium phosphate

K produces 100 parts twice as fast as G does. G produces 100 parts in 40 minutes. If each produces parts at a constant rate, how many parts will K produces in 6 minutes.

A

30

B

25

C

20

D

15

The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for

A

Recovery of tannis from the tree barks and woods

B

Leaching sodium nitrate from Chilean nitrate bearing rock

C

Both A & B

D

Neither A nor B

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

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