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

Assertion (A) : When zinc is added to dilute  hydrochloric acid, hydrogen is given off.  

Reason (R): Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms.  


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.  




The metal zinc readily reacts with  hydrochloric acid to produce hydrogen ga s (H 2 )  and zinc chloride (ZnCl 2 ).

The reaction is given below:

Zn + 2HCl → ZnCl 2 + H 2

Reaction of Zinc with Hydrochloric Acid - Teachoo-01.jpg


Hydrochloric acid molecules contain chloride and hydroxide ions .  



  • Assertion is true
  • Reasoning is true
  • And Reasoning is not the correct explanation of Assertion

So, the correct answer is (b)   

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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