# Calcination is used in metallurgy for removal of?

$(a)\;\text{Water and sulphide} \\(b)\;\text{Water and$CO_2$} \\(c)\;\text{$CO_2$and$H_2S$} \\ (d)\;\text{$H_2O$and$H_2S$}$

Calcination is used in metallurgy for removal of Water and $CO_2$
Hence b is the correct answer.