In the extraction of silver,$Ag_2S$ is dissolved in :

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:

During the extraction of sodium metal by electrolysis,a mixture of $40\% \ NaCl$ and $60\% \ CaCl_2$ is used because...

Which one of the following organizations' iron and steel plant was built to use charcoal as a source of power,to start with,but later switched over to hydroelectricity?

When a metal is to be extracted from its ore,if the gangue associated with the ore is silica,then

Which process is used for the purification of aluminum?