Smelting is done in

In the alumino-thermite process,$Al$ acts as:

Which among the following reactions occurs at the zone of slag formation in the extraction of iron by a blast furnace?

The reduction of $Al$ oxide cannot be carried out by chemical reactions because .....

Leaching of gold with dilute aqueous solution of $NaCN$ in presence of oxygen gives complex $[A]$,which on reaction with zinc forms the elemental gold and another complex $[B]$. $[A]$ and $[B],$ respectively are ...... .

In the extraction of copper from its sulphide ore,metal is finally obtained by the oxidation of cuprous sulphide with