$A l C l_{3}$ achieves stability by forming a dimer. In trivalent state the compound is hydrolysed in water. $A l C l_{3}$ in acidified aqueous solution forms :

A l (O H)_{3} + H C l

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[A l (H_{2} O)_{6}]^{3 +} + 3 C l^{-}

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A l C l_{3} .2 H_{2} O

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A l_{2} O_{3} + H C l

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Solution

The correct option is A $[A l (H_{2} O)_{6}]^{3 +} + 3 C l^{-}$
Answer:- (B) $[A l ({H_{2} O)}_{6}]^{+ 3} + 3 {C l}^{-}$

The electron deficiency of Aluminium atom in $A l {C l}_{3}$ is compensated by formation of co-ordinate bond between lone pair of Chlorine atom of another $A l {C l}_{3}$ molecule and the empty unhybridised p orbital of Aluminium atom, thus forms dimer and in acidified aqueous solution forms $[A l ({H_{2} O)}_{6}]^{+ 3} + 3 {C l}^{-}$ .

$A l {C l}_{3} + 6 H_{2} O ⟶ [A l ({H_{2} O)}_{6}]^{+ 3} + 3 {C l}^{-}$

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Similar questions

Q. Assertion: Solution of

A l C l_{3}

in water is neutral
Reason:

[A l (H_{2} O)_{6}]^{3 +}

is formed

Aluminium chloride exists as dimer, $A l_{2} C l_{6}$ in solid state as well as in solution of non-polar solvent such as benzene. When dissolved in water it gives:

$A l_{2} O_{3}$ can be converted to anhydrous $A l C l_{3}$ by heating.

Q. The hybridised state of

{A l}^{3 +}

in the complex ion formed when

A l {C l}_{3}

is treated with aqueous acid is:

Boron halides are monomeric while AlCl₃ forms dimer. Why?

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AlCl3 achieves stability by forming a dimer. In trivalent state the compound is hydrolysed in water. AlCl3 in acidified aqueous solution forms :

$A l C l_{3}$ achieves stability by forming a dimer. In trivalent state the compound is hydrolysed in water. $A l C l_{3}$ in acidified aqueous solution forms :