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Anhydrous AlCl(3) is covalent from the d...

Anhydrous `AlCl_(3)` is covalent from the data given below, perdict whether it would remain covalent or between ionic in aqueous solution
`IE_(1)` of `Al = 5140 kJ mol^(-1)`
`Delta_("hyd")H^(ɵ)(Al^(3+)) = -4665 kJ mol^(-1)`
`Delta_("hyd")H^(ɵ)(Cl^(ɵ)) = -380 kJ mol^(-1)`

Text Solution

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The correct Answer is:
C
If `AlCl_(3)` is present in ionic state in aqueous solution, it will have `Al^(3+)` and `3Cl^(-)` ions. Standard heat of hydration of `Al^(3+)` and `3Cl^(-)` ions.
`=-4665 + 3 xx (-381) = -5808` kJ/mole.
Required energy of ionization of Al = 5137 kJ/`"mole"^(-1)`
Hydration energy overcomes ionization energy
`therefore AlCl_(3)` would be ionic in aqueous solution.
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