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The pair that does NOT require calcination is

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ZnO and Fe₂O₃. xH₂O

ZnO and MgO

ZnCO₃ and CaO

Fe₂O₃ and CaCO₃MgCO₃

answer is A.

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Detailed Solution

Calcination process is a method of concentration of ores in which ore is heated in absence of air at a very high temperature. ZnO and MgO

Pair does not require calcination as ZnO is purified by self reduction processes and MgO by an electrolysis process.

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