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  • On addition of aqueous to a salt solution, a white gelatinous precipitate is formed, which dissolve

On addition of aqueous \text{NaOH} to a salt solution, a white gelatinous precipitate is formed, which dissolves in excess alkali. The salt solution contains

Option: 1

Chromium ions


Option: 2

Aluminium ions


Option: 3

Barium ions


Option: 4

Iron ions


Answers (1)

best_answer

As we have learnt,

Aluminium ions form a gelatinous white precipitate with \text{NaOH} which dissolves in the excess of the reagent owing to the formation of Aluminate ions

\mathrm{Al}^{+3}+3\ \mathrm{OH}^{-} \rightarrow \mathrm{Al}(\mathrm{OH})_{3}

\mathrm{Al}(\mathrm{OH})_{3}+\mathrm{NaOH} \longrightarrow \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_{4}\right]

Hence, the correct answer is Option (2)

Posted by

Irshad Anwar

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