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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a

Cu2O,SnO2

b

Fe2O3,ZnO

c

CaO,K2O

d

PbO,Fe3O4

answer is C.

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