Q.

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is

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Cu2O,SnO2

Fe2O3,ZnO

CaO,K2O

PbO,Fe3O4

answer is C.

(Detailed Solution Below)

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Detailed Solution

Ca and K are strong reducing agents, hence their oxides can not be reduced with carbon

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