Which process is used for the refining of iron?

The method,which is based on the principle that "different components of a mixture are differently adsorbed on an adsorbent" is called

Assertion : Lead,tin and bismuth are purified by liquation method.
Reason : Lead,tin and bismuth have low $m.p.$ as compared to impurities.

In electrorefining of metals,the anode and cathode are taken as a thick slab of impure metal and a strip of pure metal,respectively,while the electrolyte is a solution of a complex metal salt. This method cannot be applied for the refining of:

Given below are two statements.
Statement $I:$ During electrolytic refining,blister copper deposits precious metals.
Statement $II:$ In the process of obtaining pure copper by electrolysis method,blister copper is used to make the anode.
In the light of the above statements,choose the most appropriate answer from the options given below.

The method of zone refining of metals is based on the principle of