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Solution


Q.

Assertion: Dry HCl gas does not change the colour of the dry litmus paper.
Reason: It is because dry HCl does not contain the H+ ions.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true  

Ans.

(1)

Colour of the litmus paper is changed by the hydrogen ions. Dry HCl gas does not contain H+ ions. Acids give hydrogen ions only in the presence of aqueous solution. In case of dry litmus paper and dry HCl, water is not present. Therefore, the colour of the litmus paper does not change.