White fumes appear around the bottle of anhydrous aluminium chloride.
Or
Why aluminium chloride in air?

Solution

Anhydrous aluminium chloride is partially hydrolysed with atmospheric moisture to liberate HCl gas.

AlCl subscript 3 space plus space stack 3 straight H subscript 2 straight O with left parenthesis from space air right parenthesis below space space rightwards arrow space space space Al left parenthesis OH right parenthesis subscript 3 space plus space 3 HCl left parenthesis straight g right parenthesis

Moist HCl appears white in colour.

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