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  • Acids, Bases and Salts Online Quiz
  • Which ion forms a red/brown precipitate when sodium hydro...
Multiple choice

Which ion forms a red/brown precipitate when sodium hydroxide solution is added?

  1. Fe2+

  2. Fe3+

  3. Cu2+

  4. Cl-

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Iron(III) ions (Fe3+) react with hydroxide ions to form iron(III) hydroxide, which is a red/brown precipitate.

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