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Chemical Reaction

Which of the ...

Question

Which of the following ions in solution would form a reddish-brown precipitate when aqueous sodium hydroxide solution is added dropwise to it?

A

Copper (II) ions

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B

Iron (II) ions

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C

Iron (III) ions

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D

Zinc ions

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Solution

The correct option is C Iron (III) ions
The precipitate changes colour as the iron(II) hydroxide complex is oxidised by the air to iron(III) hydroxide.
${[F e {(H_{2} O)}_{6}]}^{3 +} + 3 N H_{3} ⟶ [F e {(H_{2} O)}_{3} {(O H)}_{3}] + 3 N H_{4}^{+}$

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