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NEET levelSingle correct optionDifficulty 1 of 3ia003

For a salt $BA$ of a weak base $BOH$ (with $K_{b}$ ) and a strong acid, the hydrolysis constant is

A $K_{h} = K_{w} K_{b}$
B $K_{h} = K_{w} / K_{b}$
C $K_{h} = K_{b} / K_{w}$
D $K_{h} = K_{w} / K_{a}$

Answer: B

The cation

B X^{+}

reacts as an acid:

B X^{+} + H X_{2} O BOH + H X^{+}

. Multiplying

K_{a} (B X^{+})

and

K_{b}

gives

K_{w}

, so

K_{h} = K_{a} (B X^{+}) = K_{w} / K_{b}

.

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