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Class 10
Chapter 3 Class 10 - Metals and Non-Metals

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)

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo