Explain why zinc oxide can be reduced to metal by heating with carbon and not with `Cr_(2)O_(3)`.

Why can zinc oxide be reduced to the metal by heating with carbon and not with Cr_(2)O_(3) ?

Why Zinc oxide can be reduced to the metal by heating with Carbon andnot with Cr_2O_3 ?

Zinc oxide can be reduced only by ...

Give reasons for the following : (a) Alumina is dissolved in cryolite for electrolysis instead of being electrolyzed directly. (b) Zinc oxide can be reduced to metal by heating with carbon but Cr_(2)O_(3) cannot be reduced by heating with carbon.

The metal oxide which cannot be reduced to metal by carbon is