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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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a
Cu2O,SnO2
b
Fe2O3,ZnO
c
CaO,K2O
d
PbO,Fe3O4

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detailed solution

Correct option is C

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

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