In the processing of steel,which of the following allotropes of carbon is used?

Extraction of a metal $(M)$ from its sulfide ore $(M_2S)$ involves the following chemical reactions:
$2M_2S + 3O_2 \xrightarrow{\text{heat}} 2M_2O + 2SO_2 \uparrow$
$M_2S + 2M_2O \xrightarrow{\text{heat}} 6M + SO_2 \uparrow$
The metal $(M)$ may be

Which of the following processes involves smelting?

Highly electropositive metals cannot be commercially extracted by the carbon reduction process at high temperatures because these

Which of the following oxides can be reduced to the metal by heating it in a stream of hydrogen?

Which of the following is the correct chemical formula for slag?