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The reaction 2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂ produces bubbles because:

The reaction 2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂ produces bubbles because:
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  • A Carbon dioxide escapes
  • B Hydrogen disappears
  • C Calcium oxide precipitates
  • D Oxygen gas forms
Correct Answer: Option A
Explanation:
Carbon dioxide gas is produced when acids react with carbonates. The escaping gas forms bubbles or effervescence during the reaction.

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