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Question:

The pair that does not require calcination is:

Fe2O3andCaCO3⋅MgCO3

ZnOandMgO

ZnOandFe2O3⋅xH2O

ZnCO3andCaO

Solution:

The correct option is A ZnO and MgO. ZnO and MgO both are in oxide form therefore no change on calcination.