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

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

A

Sulphuric

B

Hydrochloric

C

Either A or B

D

Neither A nor B

Action of phosphoric acid on rock phosphate produces

A

Superphosphate

B

Triple superphosphate

C

Nitrophosphate

D

Diammonium phosphate

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

Reaction of dilute sulphuric acid with phosphate rock produces

A

Phosphoric acid

B

Superphosphate

C

Triple superphosphate

D

Gypsum

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

A

Carbonate

B

Phosphate

C

Bicarbonate

D

Silicate

Sulphuric acid pickling tanks are lined with

A

Nickel

B

Rubber

C

Aluminium

D

Glass

a chemial is mixed 30 ml mixed , 10 ml is acid , how much ml of acid must be mixed such that a 50/50 mixure of water and acid is attend if no additional water is added

A

20

B

10

C

40

D

30

The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

A

Avoid mechanical weakening of fibre

B

Remove lignin by way of crystallisation

C

Increase the cellulose content

D

None of these

In sulphate pulp manufacture, the pressure and temperature in the digestor is

A

10 atm., 800 °C

B

10 atm., 170-180°C

C

1 atm., 170 - 180°C

D

L atm., 800°C

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

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