JEE Main · 2004 · 24 Apr 2004 · Offline · p-Block Elements

Aluminium chloride exists as dimer,

Al_{2} Cl_{6}

in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

(A) $Al^{3 +} + 3 Cl^{-}$
(B) $Al_{2} O_{3} + 6 HCl$
(C) $[Al (OH)_{6}]^{3 -}$
(D) $[Al (H_{2} O)_{6}]^{3 +} + 3 Cl^{-}$ ✓ Correct

Answer: (D)

Solution

In benzene or as a solid, aluminium chloride stays as the dimer

Al X_{2} Cl X_{6}

, but water changes the story. The small, highly charged

Al X^{3 +}

is strongly hydrated and gathers six water molecules about itself as the hexaaqua ion, while the chlorides are released, following

AlCl X_{3} + 6 H X_{2} O [Al (H X_{2} O) X_{6}] X^{3 +} + 3 Cl X^{-}

. So the species present in water are

[Al (H X_{2} O) X_{6}] X^{3 +}

and

Cl X^{-}

JEE Main · 2004 · 24 Apr 2004 · Offline · Single correct option

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