MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic Chemistryp-Block (group 13 and 14)Aluminium and Its Compounds

Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives

A.[Al(OH)6]3– + 3HCl

B.[Al(H2O)6]3+ + 3Cl–✓ Correct

C.Al3+ + 3Cl–

D.Al2O3 + 6HCl

Explanation

Aluminium chloride can form a dimer like 2 6 Al Cl . In solid-state as well as in the solution of non-polar solvents such as benzene aluminum chloride exists as a dimer. When it dissolves in water, it gives aluminium hexa hydroxide anion with hydrochloric acid, as follows. 3 2 6 2 2 6 Al Cl 12H O 2 A ] l H O 6 [ ( ) Cl + - + ® +

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