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Aluminium chloride exists as dimer, \( \mathrm{Al}_{2} \mathrm{Cl}_{6} \) in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives-
(1) \( \mathrm{Al}^{3+}+3 \mathrm{Cl}^{-} \)
(2) \( \left[\mathrm{Al}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}+3 \mathrm{Cl}^{-} \)
(3) \( \left[\mathrm{Al}(\mathrm{OH})_{6}\right]^{3-}+3 \mathrm{HCl} \)
(4) \( \mathrm{Al}_{2} \mathrm{O}_{3}+6 \mathrm{HCl} \)
\( \mathrm{P} \)
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