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 $300$

Answer 1

Answer: (B)

Dilute $KCl$ solution in contact with blood charcoal.

Answer 2

When the concentration of the adsorbate is less on the surface relative to its concentration in the bulk it is called negative adsorption. Add from left in this adsorption, concentration of dilute $KCl$ solution is less on the surface of blood charcoal relative to its concentration in solution.