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  • Acids, Bases and Salts Online Quiz
  • Which ion forms a blue precipitate when sodium hydroxide ...
Multiple choice

Which ion forms a blue precipitate when sodium hydroxide solution is added?

  1. Fe2+

  2. Fe3+

  3. Cu2+

  4. Cl-

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

Copper(II) ions (Cu2+) react with sodium hydroxide to form copper(II) hydroxide, which is a characteristic blue precipitate.

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