Multiple choice

Which one of the following metals does not form amalgams?

  1. Zinc

  2. Copper

  3. Magnesium

  4. Iron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An amalgam is an alloy of mercury with another metal. Most metals form amalgams readily when combined with mercury. Iron is unique among common metals in that it does not form an amalgam under ordinary conditions. This property is exploited in mercury extraction processes where iron plates are used to collect mercury. Zinc, copper, and magnesium all readily form amalgams with mercury.

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