Which one of the following is not a calcination reaction?
- A$ZnCO_3 \xrightarrow{\Delta} ZnO + CO_2$
- B$Fe_2O_3 \cdot xH_2O \xrightarrow{\Delta} Fe_2O_3 + xH_2O$
- C$CaCO_3 \cdot MgCO_3 \xrightarrow{\Delta} CaO + MgO + 2CO_2$
- D$CaCO_3 + 2HCl \xrightarrow{\Delta} CaCl_2 + H_2O + CO_2$
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