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NEET levelSingle correct optionDifficulty 1 of 3ie176

Assuming ideal behaviour, in which of the following will $AgCl$ be least soluble?

Apure water
B $0.1 M NaCl$
C $0.1 M KNO X_{3}$
D $0.1 M CaCl X_{2}$

Answer: D

Solubility

= K_{s p} / [Cl X^{-}]

when chloride is added.

0.1 M CaCl X_{2}

gives

[Cl X^{-}] = 0.2 M

, the highest common ion concentration, so

s = 1.8 \times 1 0^{- 10} /0.2 = 9.0 \times 1 0^{- 10} M

is lowest.

NaCl

gives

1.8 \times 1 0^{- 9} M

and

KNO X_{3}

has no common ion.

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