Chemical reduction is not suitable for converting

Out of $C$ and $CO$,which is a better reducing agent at $673 \, K$?

The reaction for obtaining the metal $(M)$ from its oxide $(M_{2}O_{3})$ ore is given by
$M_{2}O_{3(s)} + 2 Al(\ell) \xrightarrow{\text{Heat}} Al_{2}O_{3}(\ell) + 2 M_{(s)}$, $(s = \text{solid}, \ell = \text{liquid})$
In this case, $M$ is

Blister $Cu$ contains approximately ....... $\%$ $Cu$.

Formation of metallic copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reactions?

The materials mixed with the ore before it is subjected to smelting in the extraction of iron are: