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NEET levelSingle correct optionDifficulty 1 of 3ie169

Solid $NaCl$ is added to a saturated solution of $AgCl$ at constant temperature. Which statement is correct?

A $[Ag X^{+}]$ increases because more ions are present
BNothing happens because $K_{s p}$ is constant
CSome $AgCl$ precipitates and $[Ag X^{+}]$ decreases
D $K_{s p}$ of $AgCl$ increases

Answer: C

Added

Cl X^{-}

makes the ionic product

[Ag X^{+}] [Cl X^{-}]

exceed

K_{s p}

. The equilibrium shifts towards solid

AgCl

, so

[Ag X^{+}]

falls (common ion effect) while

K_{s p}

depends only on temperature.

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