Acids react with metal carbonates to liberate ______ gas.
- AH2
- BCO2
- CCO
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (b) CO2
Explanation
Acids react with metal carbonates to give salt, water and a gas.
The carbonate ion reacts with hydrogen ions from the acid to liberate carbon dioxide (CO2) gas.
General reaction: Metal carbonate + Acid → Salt + CO2 + Water; the gas turns limewater milky.