Which of the foll A. CaCO₃→CaO + CO₂

B.

C.

D.

Calcination involves the heating when the volatile matter escapes leaving behind the metal oxide in the limited supply of air. Ores that contain carbonates, hydroxides or oxides can be calcined.

_Thus,

CaCO₃→CaO + CO₂

_{So, only reaction (i) and (iii) will undergo calcination.}