On heating a mixture of $Cu_2O$ and $Cu_2S$,the product obtained is:

$CN^{-}$ solution is used in the extraction of which metal?

According to the Ellingham diagram,at lower temperatures,the oxidation of $C$ to $CO$ is useful for the reduction of which of the following?

In the extraction of copper from copper pyrites,iron is removed as

Extraction of metal from the ore cassiterite does not involve:

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: