A. Salt & coke
B. Sand & coke
C. And coke
D. And sand
Related Mcqs:
- 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 - Electric furnace method for production of phosphorous uses phosphate rock and _________________________?
A. Phosphoric acid
B. Coke
C. Sulphuric acid
D. Silica and coke - Heating a mixture of phosphate rock, coke and sand in an electric furnace produces___________________?
A. Phosphoric acid
B. Ammonium phosphate
C. Phosphorous
D. Superphosphate - 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 - Yield of elemental phosphorous from rock phosphate is about _____________ percent?
A. 1-2
B. 15-25
C. 40-45
D. 60-65 - 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 - Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at ____________ °C in absence of air?
A. 50-80
B. 250-400
C. 1000-1200
D. 800-900 - Red phosphorous is changed into white phosphorous by______________________?
A. Heating in presence of light
B. Melting under pressure
C. Vaporisation followed by condensation
D. None of these - Reaction of ______________ acid with phosphate rock produces superphosphates?
A. Hydrochloric
B. Sulphuric
C. Nitric
D. Phosphoric - Triple superphosphate which contains about 46% P2O5 is produced by the reaction of phosphate rock with ortho phosphoric acid of_____________ percent concentration?
A. 25-28
B. 52-54
C. 75-80
D. > 98
