Question

(I) When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains sulphides of copper (II) and iron (II).
(II) Zone refining is based on the principle that impurities are more soluble in molten metal than in solid metal.
(III) In the metallurgy of aluminium, graphite anode is oxidised to carbon monoxide and carbon dioxide.
Correct statements amongs the following are:

• A. I, II
• B. II, III
• C. I, III
• D. all of the above

Answer 1

The correct option is B II, III

When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte ($C{u}_{2}S+{FeS}_{\left(\text{little}\right)}$) contains sulphides of copper (I) and iron (II).

Thus, the statement I is incorrect.

All other statements are correct as:

Zone refining is based upon fractional crystallization as the impurity prefers to stay in the melt and on solidification only pure metals solidifies on the surface of the melt.

In this process solubility of the impurities in the metal in molten is greater than in solid.

And in the metallurgy of aluminium, graphite anode is oxidised to carbon monoxide and carbon dioxide.

Hence, the correct option is $\text{B}$