Which one of the following salts on being dissolved in water given $p H > 7$ at $25^{o} C$ ?

K C N

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K N O_{3}

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N H_{4} C l

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N H_{4} C N

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Solution

The correct option is B $K C N$
$K C N + H_{2} O ⇌ K O H + H C N$
$K C N$ is a salt of strong base and weak acid. Thus because of the presence of strong base the $p H$ becomes greater than 7.

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