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Question

Ionisation energy of Al to Al3+=5137kJ mol1 Hhydration of:Al3+=4665 kJ mol1 and for Cl=381 kJ mol1. Which of the following statement is correct?

A
AlCl3 would remain covalent in aqueous solution
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B
Only at infinite dilution AlCl3 undergoes ionisation
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C
In aqueous solution AlCl3 becomes ionic
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D
None of these
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Solution

The correct option is C In aqueous solution AlCl3 becomes ionic
If AlCl3 is present in ionic state in aqueous solution, therefore it has Al3+ and 3Cl
Standard heat of hydration of Al3+ and 3Cl ions
=(H)hydration for Al+3+3×(H)hydration for Cl
=4665+3×(381)kJ mol1
=5808 kJ/mol
Required energy of ionisation of Al=5137 kJ mol1
Hydration energy dominates ionisation energy
AlCl3 would be ionic in aqueous solution.

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