Question

Which of the following processes for refining of metals involves the principle of selective adsorption of the components from a mixture?

• A. Electrolytic refining
• B. Chromatography
• C. Polling
• D. Zone refining

Hint:

Chromatography always works on differential adsorption or partition of components between two phases.

Answer 1

The Correct Option is B

Step 1: Understand selective adsorption.
Selective adsorption refers to the phenomenon where different components of a mixture are adsorbed to different extents on a solid surface.

Step 2: Principle of chromatography.
Chromatography separates components of a mixture based on their different adsorption affinities towards the stationary phase.

Step 3: Analysis of options.
(A) Electrolytic refining: Based on electrochemical principles, not adsorption.
(B) Chromatography: Correct — separation is based on selective adsorption.
(C) Polling: Used to remove impurities from molten metals, not adsorption-based.
(D) Zone refining: Based on difference in solubility of impurities in molten metal.

Step 4: Conclusion.
Chromatography is the refining process that involves selective adsorption of components.