Which one of the following metals is extracted by thermal reduction process?

During the extraction of $Fe$,which reaction is performed in the combustion zone?

Which method is used to obtain $Al$ from $Al_2O_3$?

The plot shows the variation of $- \ln K_p$ versus temperature for the two reactions:
$M_{(s)} + \frac{1}{2} O_{2(g)} \to MO_{(s)}$ and $C_{(s)} + \frac{1}{2} O_{2(g)} \to CO_{(g)}$
Identify the correct statement.

How is 'cast iron' different from 'pig iron'?

Among the following groups of oxides,the group containing oxides that cannot be reduced by $C$ to give the respective metal is