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

Options

A. `Fe_(2)O_(3),ZnO`
B. `PbO,Fe_(3)O_(4)`
C. `Cu_(2)O,SnO_(2)`
D. `CaO,K_(2)O`

Explanation

(d) potassium and calcium are strong reductant hence their oxides cannot be reduced by carbon.