On addition of aqueous to a salt solution, a white gelatinous precipitate is formed, which dissolves in excess alkali. The salt solution contains
Chromium ions
Aluminium ions
Barium ions
Iron ions
As we have learnt,
Aluminium ions form a gelatinous white precipitate with which dissolves in the excess of the reagent owing to the formation of Aluminate ions
Hence, the correct answer is Option (2)
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