Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

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

Electric furnace method for production of phosphorous uses phosphate rock

A

And phosphoric acid

B

And coke

C

And sulphuric acid

D

Silica and coke

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

A

250-300

B

500-750

C

950-1050

D

1400-1450

An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.

A

Resistance

B

Arc

C

Low frequency induction

D

None of these

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

Low grade phosphate rock can be used in electrical furnace, because

A

Of the better CaO/SiO₂ balance for slag formation

B

CaO content is less

C

It is cheap

D

It produces low cost product

Reaction of nitric acid and sulphuric acid with phosphate rock produces

A

Nitrophosphate

B

Diammonium phosphate

C

Tricresyl phosphate

D

Tributyl phosphate

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

Reaction of dilute sulphuric acid with phosphate rock produces

A

Phosphoric acid

B

Superphosphate

C

Triple superphosphate

D

Gypsum

Heating a mixture of phosphate rock, coke and sand in an electric furnace produces

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