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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb032

Select the correct statement(s).

A $Al (OH) X_{3}$ dissolves in excess aqueous NaOH to give $[Al (OH) X_{4}] X^{-}$ .
B $Al X_{2} O X_{3}$ dissolves in excess aqueous ammonia.
CA solution of $AlCl X_{3}$ in water is acidic.
DAnhydrous $AlCl X_{3}$ is a typical ionic solid.

Answer: A, C

Amphoteric

Al (OH) X_{3}

dissolves in excess strong alkali, so A is true. Hydrolysis of

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

makes the solution acidic, so B is true. Ammonia is too weak a base to dissolve alumina, so C is false. Anhydrous

AlCl X_{3}

is covalent (dimeric

Al X_{2} Cl X_{6}

), so D is false.

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