Related Questions

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
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
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
The most stable allotropic form of phosphorous is the __________ phosphorous.
A White
B Black
C Yellow
D Red
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
Both white phosphorous as well as red phosphorous
A Are soluble in CS2
B Burns when heated in air
C Reacts with hot caustic soda solution to give phosphine
D All of the above
__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
A Calcium
B Fluorine
C Phosphorous
D Sulphur
Leaching of phosphate rock by strong __________ acid produces phosphoric acid.
A Sulphuric
B Hydrochloric
C Either A or B
D Neither A nor B
Triple superphosphate is made by reacting phosphate rock with __________ acid.
A Phosphoric
B Nitric
C Sulphuric
D Hydrochloric

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