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JEE Main levelSingle correct optionDifficulty 2 of 3pb134

An aqueous solution of $AlCl X_{3}$ is acidic because

A $[Al (H X_{2} O) X_{6}] X^{3 +}$ donates protons to water
B $Cl X^{-}$ is a strong base
C $Al X^{3 +}$ is reduced by water
D $AlCl X_{3}$ dissolves with evolution of $Cl X_{2}$

Answer: A

The small, highly charged

Al X^{3 +}

polarises coordinated water:

[Al (H X_{2} O) X_{6}] X^{3 +} + H X_{2} O [Al (H X_{2} O) X_{5} (OH)] X^{2 +} + H X_{3} O X^{+}

. Cl- is the conjugate base of a strong acid and does not hydrolyse.

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