The pair that does NOT require calcination is :

Question:

The pair that does NOT require calcination is :

  1. $\mathrm{ZnO}$ and $\mathrm{MgO}$

  2. $\mathrm{ZnO}$ and $\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot x \mathrm{H}_{2} \mathrm{O}$

  3. $\mathrm{ZnCO}_{3}$ and $\mathrm{CaO}$

  4.  $\mathrm{Fe}_{2} \mathrm{O}_{3}$ and $\mathrm{CaCO}_{3} \cdot \mathrm{MgCO}_{3}$

Correct Option: 1

Solution:

Calcination involves the conversion of metal carbonates or hydrated oxides into metal oxides. $\mathrm{ZnO}$ and $\mathrm{MgO}$ are oxides, therefore, does not require calcination.

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