First slide

Atomic and physical properties

Question

Statement 1: ${AlCl}_{3}$ forms dimer ${Al}_{2} {Cl}_{6}$ in gaseous state but it dissolves in $H_{2} O$ forming ${[Al {(H_{2} O)}_{6}]}^{3 +}$ and $3 {Cl}^{-}$ ions.
Statement 2: Aqueous solution of ${AlCl}_{3}$ is acidic due to hydrolysis.

Moderate

A

Both statements 1 and 2 are correct
B

Statement 1 is correct and statement 2 is incorrect
C

Statement 1 is incorrect and statement 2 is correct
D

Both statements 1 and 2 are incorrect

Solution

Statement 1: In gaseous phase and in non-polar solvent like benzene ${AlCl}_{3}$ exists as dimer, ${Al}_{2} {Cl}_{6}$ . High enthalpy of hydration in water breaks the covalent dimer forming ${[Al {(H_{2} O)}_{6}]}^{3 +}$ and $3 {Cl}^{-}$ .
Statement 2: ${AlCl}_{3} + 3 H_{2} O \overset{}{\to} Al {(OH)}_{3} + 3 HCl$

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