Red Seal Plumbing Practice Exam

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What is formed when groundwater absorbs carbon dioxide?

  1. Acid rain

  2. Sulfuric acid

  3. Weak carbonic acid

  4. Hydrochloric acid

The correct answer is: Weak carbonic acid

Carbon dioxide readily dissolves in water and creates carbonic acid, which is a weak acid. Acid rain is formed when sulfur and nitrogen oxides mix with water in the atmosphere, not when groundwater absorbs carbon dioxide. Sulfuric acid and hydrochloric acid are strong acids and are not formed when groundwater absorbs carbon dioxide. Therefore, the correct option is C, weak carbonic acid.

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