Related Questions

Yield of elemental phosphorous from rock phosphate is about __________ percent.
A 1-2
B 15-25
C 40-45
D 60-65
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
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces
A Phosphoric acid
B Ammonium phosphate
C Phosphorous
D Superphosphate
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
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
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

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