Question 1 - Assertion Reasoning Questions (MCQ) - 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.  

Answer 

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

Also,

Hydrochloric acid molecules contain chloride and hydroxide ions .  

Thus,

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

So, the correct answer is (b)