Question

The extent of ionization of weak electrolyte increases:

• A. with increase in concentration of the solute
• B. on addition of excess of water
• C. on decreasing the temperature
• D. on stirring the solution vigorously

Answer 1

Answer: (B)

on addition of excess of water

On adding an excess of water, the concentration decrease.
We know,

$\alpha \propto \frac{1}{\sqrt{C}}$

$\therefore$ As concentration increases, $\alpha$ (degree of dissociation) decreases.

Option B is correct.