The aqueous solution of AlCl3 contains Al3+ ions because

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The aqueous solution of AlCl₃ contains Al³⁺ ions because

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Its higher hydration energy compensates its high ionisation energy

Its higher ionisation energy compensates its higher hyhdration energy

Its hydration energy is same as its ionisation energy

Al is amphoteric metal

answer is A.

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Detailed Solution

${AlCl}_{3} + 6 H_{2} O \to [Al {(H_{2} O)}_{6}] {Cl}_{3} \approx {[Al {(H_{2} O)}_{6}]}^{+ 3} + 3 {Cl}^{-}$

In $[Al {(H_{2} O)}_{6}] {Cl}_{3}$ , the oxidation state of Al is +3.

Ionisation energy is absorbed energy for the removal of three electrons.

Where as hydration energy is released energy during hydration of one mole of Al⁺³ ions.

In the above reaction both the processess are involved but hydration energy is greater than that of ionisation energy.

Hence removal of three electrons easily takes place and gives Al⁺³ ion in solution.

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