A. 1-2
B. 15-25
C. 40-45
D. 60-65
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 - 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 - 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 - 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 - Triple superphosphate is made by reacting phosphate rock with _____________ acid?
A. Phosphoric
B. Nitric
C. Sulphuric
D. Hydrochloric - Reaction of ______________ acid with phosphate rock produces superphosphates?
A. Hydrochloric
B. Sulphuric
C. Nitric
D. Phosphoric - Rock phosphate constitutes mainly of___________________?
A. Fluorapatite
B. Di-calcium phosphate
C. Mono-calcium phosphate
D. Di-ammonium phosphate - Reaction of nitric acid and sulphuric acid with phosphate rock produces_________________?
A. Nitrophosphate
B. Diammonium phosphate
C. Tricresyl phosphate
D. Tributyl phosphate
