Class 10
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.




To sully means to damage the purity. 


Here, the reaction is

Reaction of Lime Water with Carbon Dioxide - Teachoo-01.jpg


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. 



  • Assertion is true
  • Reasoning is false


So, the correct answer is (c)   

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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