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NEET levelSingle correct optionDifficulty 1 of 3ie168

If $s$ is the molar solubility, which salt has $K_{s p} = 27 s^{4}$ ?

A $BaSO X_{4}$
B $Ag X_{2} CrO X_{4}$
C $CaF X_{2}$
D $Al (OH) X_{3}$

Answer: D

27 s^{4}

arises for an

AB X_{3}

salt:

[A] = s

,

[B] = 3 s

, so

K_{s p} = s (3 s)^{3} = 27 s^{4}

.

Al (OH) X_{3}

is of this type, while

BaSO X_{4}

gives

s^{2}

and

Ag X_{2} CrO X_{4}

,

CaF X_{2}

give

4 s^{3}

.

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