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Question

Anhydrous AlCl3 is covalent. from the data given below
Lattice Energy =5137KJmol1
H hydration Al3+=4665 KJ/mol1
H hydration Cl=381KJ/mol1
Identify the correct statement-

A
It will remain covalent in aqueous solution
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B
The solution will consists of AI3+ and CI
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C
The solution will consists of hydrate AI3+ and CI
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D
None of these
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Solution

The correct option is D The solution will consists of AI3+ and CI
AlCl3(anhydrous)AlCl3(aq)

ΔH of reaction= Energy rleased during hydration + Energy used during ionization
4665(3×381)+5137=671

Thus AlCl3 would become ionic in aqueous solution as the formation of ions will take place because ΔHhydration>ΔHionization

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