Select the correct statement(s) with respect to the differences between roasting and calcination
A. In roasting at higher temperature sulphide ores of the some metal like Cu,Pb,Hg etc., are rduced directly to metal but not in calcination.
B. Partial fusion occurs in calcination by tno tin roasting.
C. Calcination is done is limited supply of air or absence of air but in roasting supply of excess air is required.
D. Combination reaction occurs in roasting but not in calcination.
