Select the correct statement(s) with respect to the differences between roasting and calcination

Options

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 but not in 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.

Answer

A,C