Consider two chemical reactions (A) and (B) that take place during metallurgical process:
`(A) ZnCO_(3(s)) overset(Delta)to ZnO_((s)) +CO_(2(g)) "
" (B) 2ZnS_((s)) +3O_(2(g)) overset(Delta)to ZnO_((s)) +2SO_(2(g))`
The correct options of names given to them respectively is:

Options

A. Both (A) and (B) are producing same product so both are calcination
B. (A) is roasting and (B) is calcination
C. (A) is calcination and (B) is roasting
D. Both (A) and (B) are producing same product so both are roasting

Answer

C

Explanation

`ZnCO_(3)(s) overset(Delta) to ZnO(S) + CO_(2)(g)`
Heating is absence of oxygen is calcination.
(B) `2ZnS(s) + 3O_(2)(g) to 2ZnO(g) + 2SO_(2)(g)`
Heating in presence of oxygen is roasting.
Hence (A) is calcination while (B) in roasting.