A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate...

WAEC 2025

A few drops of sodium hydroxide is added to an aqueous solution, a green precipitate is formed. The ion that may be present in the solution is

A. Cu\(^{2+}\)
B. Fe\(^{2+}\)
C. Fe\(^{3+}\)
D. NH\(_4\)\(^{+}\)

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Correct Answer: Option B

Explanation

The ion present in the solution is Iron(II) (Fe\(^{2+}\)). When aqueous sodium hydroxide (NaOH) is added to a solution containing iron(II) ions, a dirty green precipitate of iron(II) hydroxide, (Fe(OH)\(_2\)), forms. This precipitate is insoluble in excess sodium hydroxide.

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