Question

4. The following question consists of two statements - Assertion (A) and Reason (R).
Answer these questions selecting the appropriate option given below:
a. Both (A) are (R) true and R is the correct explanation of A
b. Both (A) and (R) are true but R is not the correct explanation of A
c. A is true but R is false
d. A is false but R is true
Assertion (A): HCl gas does not change the colour of dry blue litmus paper.
Reason (R): HCl gas dissolves in the water present in wet litmus paper to form H"
ions.​

Answer 1

Answer:

A is false but R is true.

Because, HCL gas does not changes the colour of wet blue litmus paper. Here in the question they give HCL gas does not change colour in dry blue litmus paper.

so, assertion is wrong.

We know that the colour of litmus paper is changed by H + ions because of acid. Dry HCL it does not dissociate to give H+ ions. Acids dissociate to give ions only in the aqueous solution. In this HCL is not in aqueous form nor litmus paper is wet, so the colour of litmus paper does not change.

so, reason is correct.

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