Which of the following will be formed, if we heat an aqueous solution of $A l C l_{3}$ to dryness?

Solid

A l C l_{3}

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Dimer

A l_{2} C l_{6}

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A l (O H)_{3}

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A l_{2} O_{3}

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Solution

The correct option is C $A l_{2} O_{3}$
We knoe $A l C l_{3}$ exists as a dimer $A l_{2} C l_{6}$
The reactions involved are given by,
$A l_{2} C l_{6} .6 H_{2} O \to A l_{2} O_{3} + 3 H_{2} O + 6 H C l$
So,option D is correct answer.

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A l t o A l^{3 +} = 5137 k J m o l^{- 1} △ H_{h y d r a t i o n} o f : A l^{3 +} = - 4665 k J m o l^{- 1} a n d f o r C l^{-} = - 381 k J m o l^{- 1} .

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