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NEET levelSingle correct optionDifficulty 1 of 3ia075

The solubility of which of the following sparingly soluble salts is practically unaffected when the pH of the solution is lowered by adding a strong acid?

A $AgCl$
B $Mg (OH) X_{2}$
C $CaF X_{2}$
D $CaC X_{2} O X_{4}$

Answer: A

Cl X^{-}

is the conjugate base of a strong acid and does not combine with

H X^{+}

. The anions

F X^{-}

,

OH X^{-}

and

C X_{2} O X_{4} X^{2 -}

are bases of weak acids and are removed by

H X^{+}

, shifting the dissolution equilibria forward.

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