Multiple choice

When some acid is put onto a piece of rock:

  1. it always reacts and gives off a gas

  2. it reacts if the rock contains a carbonate

  3. it always reacts explosively and shatters the rock

  4. it won’t react
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Many rocks, such as limestone or marble, contain calcium carbonate. When an acid is applied, it reacts with the carbonate to produce carbon dioxide gas, causing bubbling or effervescence.

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