Medium
The pair that does $Not$ require calcination is
- A$ZnO$ and $MgO$
- B$ZnO$ and $Fe_2O_3 \cdot xH_2O$
- C$ZnCO_3$ and $CaO$
- D$Fe_2O_3$ and $CaCO_3 \cdot MgCO_3$
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