Question

`AlCl_(3)` forms dimer `Al_(2)Cl_(6)` but dissolves in water forming `[Al(H_(2)O)_(6)]^(3+)` and `Cl^(Ө)` ions.
Aqueous solution of `AlCl_(3)` is acidic due to hydrolysis.
A. If both assertion and reason are true and the reason is the correct explanation of teh assertion.
B. If both assertion and reason are true but reason in not the correct explation of the assertion.
C. If assertion is true but reason is false.
D. Ifassertion is false but reason is true.

Answer 1

Correct Answer - B
Assertion: 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 `3Cl^(-)`.
Reason: `AlCl_(3)+3H_(2)OtoAl(OH)_(3)+3HCl`