1.

The pair that does NOT require calcination is : (1) ZnO and Fe2O3 .xH2O (2) Fe2O3 and CaCO3.MgCO3 (3) ZnCO3 and CaO (4) ZnO and MgO

Answer»

Correct option:  (4) ZnO and MgO

Explanation:

ZnO and MgO both are in oxide form so there is no change on calcination of ZnO and MgO whereas carbonate decompose into oxide and CO2 on calcination.



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