Class 10
Chapter 2 Class 10 - Acids, Bases and Salts

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.  


Directions: In the following questions, a statement  of assertion (A) is followed by a statement of  reason (R). Mark the correct choice as:  

(a) Both assertion (A) and reason (R) are true and  reason (R) is the correct explanation of assertion  (A).  

(b) Both assertion (A) and reason (R) are true but  reason (R) is not the correct explanation of  assertion (A).  (c) Assertion (A) is true but reason (R) is false.  

(d) Assertion (A) is false but reason (R) is true.  




Sodium carbonate reacts with excess hydrochloric acid to form sodium chloride, water and carbon dioxide.


The reaction is given below:

Sodium Carbonate reaction with Hydrochloric Acid - Teachoo-01.jpg

In this reaction, bubbles of carbon dioxide are observed.  




  • Assertion is true
  • Reasoning is true
  • And Reasoning is the correct explanation of Assertion


So, the correct answer is (a)

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo