Question

Which one of the following is a case of negative adsorption?

• A. Acetic acid solution in contact with animal charcoal.
• B. Dilute KCl solution in contact with blood charcoal.
• C. Concentration KCl solution in contact with blood charcoal.
• D. H\(_2\) gas in contact with charcoal at 300 K.

Hint:

Negative adsorption leads to a lower concentration of adsorbate on the surface compared to its concentration in the bulk phase.

Answer 1

The Correct Option is C

Negative adsorption occurs when the adsorbate concentration decreases at the surface, which is observed when KCl solution is in contact with charcoal. This results in the concentration being lower at the surface than in the bulk.