Assertion: `AlCl_(3)` ionishes in solution.
Reason: The hydration energy of `AlCl_(3)` exceeds the ionization energy.

Options

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. If assertion is false but reason is true.

Answer

A

Explanation

Ionisation energy required to convert `Al` to `Al^(3+)` is `5137 kJ mol^(-1). DeltaH_(hydration)` for `Al^(3+)` is `-4665 J mol^(-1)` and `DeltaH_(hydration)` for `Cl^(-)` is `-381 kJ mol^(-)`. So total hydration energy `-4665+(3xx-381)=-5808 kJ mol^(-1)` is greater than inosation energy.