WAEC - Chemistry (2000 - No. 15)
The gas evolved when dilute tetraoxosulphate (VI) acid reacts with sodium hydrogen trioxocarbonate (IV) is
hydrogen
oxygen
carbon (IV) oxide
sulphur (VI) oxide
Paskaidrojums
Whenever Acids react with carbonate salts to produce carbon(iv) oxide (CO2), water, and a salt:
Acid + carbonate → salt + water + carbon(iv) oxide.
In other words whenever ac acid reacts with a carbonate salt, CO2 gas is always given off or liberated. The correct answer is option C