Smelting is done in

In the extraction of which of the following metals is a complex salt formed?

Which metals are extracted using the self-reduction method?

During the electrolytic reduction of alumina,two auxiliary electrolytes $X$ and $Y$ are added to increase the electrical conductance and lower the melting point of the mixture. $X$ and $Y$ are:

In the process of extracting chromium and manganese metals from their oxides (Alumino-thermite process),aluminum is used as a ...... .

What is obtained when a mixture of $Cu_2O$ and $Cu_2S$ is heated?