Which of the following statements about anhydrous aluminium chloride is correct ?

It conducts electricity in aqueous solutions

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It exists as dimer both in the vapour state below

350^{0} C

and in non-polar solvents

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It is prepared by heating

A l_{2} O_{3}

in a stream of sulphur chloride (

S_{2} C l_{2}

) vapour and chlorine

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All of these

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Solution

The correct option is D All of these
$A l C l_{3} + H_{2} O \to A l^{3 +} (a q) + C l^{-} (a q)$

Hence, anhydrous aluminium chloride conducts electricity in aqueous solutions.

It exists as a dimer in nonpolar solvents like benzene and in vapour state below $350^{0} C$ .

$A l_{2} O_{3} + S_{2} C l_{2} + C l_{2} Δ - \to A l C l_{3} + S O_{2}$

It is prepared by heating $A l_{2} O_{3}$ in a stream of $S_{2} C l_{2}$ vapour and chlorine.

Hence, option D is correct.

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