Select the correct statement with respect to Fe 3+ ions.

Chemistry Chemical Analysis Mix Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Iron (III) ions react with H 2 S in acidic solution to give a black precipitate of Fe 2 S 3 .

Iron (III) ions react with ammonium sulphide to give the black precipitate of Fe 2 S 3 .

Iron (III) ions react with ammonium thiocyanate solution to produce deep red colouration.

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Text Solution

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The correct answer is:

2Fe 3+ + H 2 S — → 2Fe 2+ + 2H + + S ↓ (white)

2Fe 3+ + 3S 2– — → 2FeS ↓ (black) + S ↓

Fe 3+ + 3SCN – — → Fe(SCN) 3 deep red colouration

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