Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ ¬¨‚àûC in absence of air.$?

Conversion of yellow phosphorous to red phosphorous is done by heating

1.	Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ ¬¨‚àûC in absence of air.$?
A.	50-80
B.	250-400
C.	1000-1200
D.	800-900
Answer» C. 1000-1200