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(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.

A

CaO and `K_2O`

B

`Fe_2O_3` and ZnO

C

`Cu_2O` and `SnO_2`

D

PbO and `Pb_3O_4`

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The correct Answer is:
A
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