Statement 1: AlCl3 forms dimer Al2Cl6 in gaseous state but it dissolves in H2O forming AlH2O63+ and 3Cl− ions.Statement 2: Aqueous solution of AlCl3 is acidic due to hydrolysis.

Statement 1: AlCl3 forms dimer Al2Cl6 in gaseous state but it dissolves in H2O forming AlH2O63+ and 3Cl ions.

Statement 2: Aqueous solution of AlCl3 is acidic due to hydrolysis.

  1. A

    Both statements 1 and 2 are correct

  2. B

    Statement 1 is correct and statement 2 is incorrect

  3. C

    Statement 1 is incorrect and statement 2 is correct

  4. D

    Both statements 1 and 2 are incorrect

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    Solution:

    Statement 1: In gaseous phase and in non-polar solvent like benzene AlCl3 exists as dimer, Al2Cl6.  High enthalpy of hydration in water breaks the covalent dimer forming AlH2O63+ and 3Cl.
    Statement 2: AlCl3+3H2O   AlOH3+  3HCl

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