Question

Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberate hydrocarbon gases (like $C{H}_4$). This process $X$ is called ______ and the metal contains impurities of $Y$ is ___________ .

• A. $X$= cupellation, $Y$= $Cu{O}_2$
• B. $X$= polling, $Y$= $C{u}_{2}O$
• C. $X$= polling, $Y$= $CuO$
• D. $X$= cupellation, $Y$= $CuO$

Answer 1

The correct option is B $X$= polling, $Y$= $C{u}_{2}O$

The refining process of blister copper is known as polling.
The $C{u}_{2}O$ impurities are present in the copper metal.
In presence of heat of molten metals, the green logs liberate hydrocarbon gases which reduce copper oxide into copper.