Question 4 - Assertion Reasoning Questions (MCQ) - Chapter 2 Class 10 - Acids, Bases and Salts

Assertion (A): When common salt is kept open, it  absorbs moisture from the air.  

Reason (R): Common salt contains magnesium chloride.  

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 

It is true that when common salt is kept open, it  absorbs moisture from the air.

Also, Common Salt contains Sodium Chloride (NaCl) , not Magnesium chloride.

Thus,

• Assertion is true
• Reasoning is false , as Common salt does not contain magnesium  chloride

So, the correct answer is (c)  

Note: Magnesium Chloride present in common salt is a deliquescent substance i.e., it absorbs  moisture from the air when kept in open.