Which of the following pairs will show common ion effect?

N a C N + K C N

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N a C l + H C l

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N H_{4} O H + N H_{4} C l

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B a C l_{2} + B a {(N O_{3})}_{2}

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Solution

The correct option is C $N H_{4} O H + N H_{4} C l$
Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of strong electrolyte which provides an ion common to that provided by a weak electrolyte.
Ammonium hydroxide is a weak electrolyte and ammonium chloride is a strong electrolyte. Ammonium chloride provides ammonium ions common to ammonium hydroxide.
Thus, the pair $N H_{4} O H + N H_{4} C l$ shows common ion effect.

All other pairs have a mixture of strong electrolytes mixed with strong electrolyte hence they do not show common ion effect.

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The pH of 0.1 M solution of the following salts increases in the order

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N H_{4} C l + N H_{4} O H

N a_{2} S O_{4} + H_{2} S O_{4}

N H_{4} C l

N H_{4} O H

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