The extent of ionization increases:

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(B) According to Ostwald's dilution law,the degree of ionization $(\alpha)$ is inversely proportional to the square root of the concentration $(C)$ of

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On addition of excess water to solution

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(B) According to Ostwald's dilution law,the degree of ionization $(\alpha)$ is inversely proportional to the square root of the concentration $(C)$ of the electrolyte,i.e.,$\alpha = \sqrt{K_a/C}$.As the amount of water added increases,the concentration $(C)$ decreases,which leads to an increase in the degree of ionization $(\alpha)$.Therefore,the extent of ionization increases on the addition of excess water to the solution.

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