If a salt of weak acid or base is added to a solution of its acid or base respectively, the:

dissociation of acid or base is diminished

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the

p H

of the solution in case of acid increases and in case of base decreases

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mixing of two leads for precipitation

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none of the above

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Solution

The correct options are
A dissociation of acid or base is diminished
B the $p H$ of the solution in case of acid increases and in case of base decreases
Due to common ion effect, if a salt of weak acid or base is added to a solution of its acid or base respectively, the dissociation of acid or base is diminished.

As a result, concentration of hydrogen ions or hydroxide ion will change and pH of solution increases in case of acid and decreases in case of base.

As $p H = - l o g [H^{+}]$

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