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Q.

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.

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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

answer is A.

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Detailed 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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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.