Ionisation energy of `A1=5137KJmol^(-1)(DeltaH)` hydration of `Al^(3+)=-4665KJmol^(-1).(DeltaH)_(hydration)` for `Cl^(-)=-381KJmol^(-1)` . Which of the following statement is correct?

Options

A. `AlCl_(3)` would remauin covalent in aqueous solution
B. Only at infinite dilution `AlCl_(3)` undergoes ionisation
C. In aqueous solution `AlCl_(3)` becomes ionic
D. Nonee of these

Answer

C

Explanation

If `AlCl_(3)` is present in ionic state in aqueous solution, therefore it has `Al^(3+)` and `3Cl^(-)` inos
Standard heat of hydration of `Al^(3+)` and `3Cl^(-)` inos `=-4665+3xx(-381)Kjmol^(-1)`
`=-5808KJ//mol`
Required energy of ionisation of `Al=5137KJmol^(-1)`
`:.` Hydration energy overcomes ionisation energy
`:. AlCl_(3)` would be ionic in aqueous solution