Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.
Reason (R): Carbon dioxide is given off in the reaction.
- When sodium carbonate is added to dilute hydrochloric acid, a displacement reaction takes place.
- Sodium is more reactive than Hydrogen (check reactivity series )
- So it replaces Hydrogen from its solution to form Sodium Chloride solution
- Hydrogen forms HCl and CO 2 is released in gaseous form.
The reaction is as follows:
- The Assertion is True.
- Reason is also True.
And the Reason is the correct explanation for the assertion.
So, the correct answer is (a)