Multiple choice

Which of the following is not a base?

  1. Sodium hydroxide

  2. Magnesium hydroxide

  3. Ammonium hydroxide

  4. Calcium carbonate

  5. Ferric oxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Copper carbonate is a salt because bases are oxides or hydroxides of metals, but a salt is a compound made up of an acid, when a metal takes the place of the hydrogen in the acid. Calcium carbonate is formed by the reactions of calcium and carbonic acid.

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