(viii) Amongest the following groups of ...

(viii) Amongest the following groups of oxides, the group containing oxides that cannot be reducing by carbon to give the respective metals is.

`Cu_(2) O,SnO_(2)`

`Fe_(2) O_(3),ZnO`

`CaO,K_(2)O`

`PbO,Fe_(3) O_(4)`

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The correct Answer is:

`CaO` and `K_(2)O` are oxides of `Ca` and `K`, which are stronger reducing agent than carbon.

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