Question 1 - Assertion Reasoning Questions (MCQ) - Chapter 1 Class 10 - Chemical Reactions and Equations

Assertion (A): Carbon dioxide turns lime water milky.  

Reason (R): Carbon dioxide sullies the water. 

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

To sully means to damage the purity. 

Here, the reaction is

Carbon dioxide does not damage the purity of lime water. It just reacts with lime water (calcium hydroxide) to form milky precipitate of calcium carbonate. 

Thus,

• Assertion is true
• Reasoning is false

So, the correct answer is (c)