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(C) The dissociation of a weak acid like $CH_3COOH$ is suppressed by the common ion effect.$CH_3COOH \rightleftharpoons CH_3COO^- + H^+$.$HCl$ provide

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$0.001 \, M \, KCl$

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(C) The dissociation of a weak acid like $CH_3COOH$ is suppressed by the common ion effect.$CH_3COOH \rightleftharpoons CH_3COO^- + H^+$.$HCl$ provides $H^+$ ions,which suppresses the dissociation of $CH_3COOH$ due to the common ion effect.$CH_3COOK$ provides $CH_3COO^-$ ions,which also suppresses the dissociation of $CH_3COOH$ due to the common ion effect.$KCl$ is a neutral salt and does not provide any common ions ($H^+$ or $CH_3COO^-$).Therefore,the dissociation of $CH_3COOH$ is least suppressed (maximum) in the presence of $0.001 \, M \, KCl$ compared to the other options which contain common ions.

In which of the following solutions is the percentage dissociation of acetic acid maximum?

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