Question

Why is HCL gas unable to change the colour of a draught blue Litmus Paper?what happens if the Litmus Paper is moistened ?

Answer 1

Answer:

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Explanation:

It is because HCl gas is dry and there is no movement of ions in it. When litmus paper is moistened the gas becomes wet again and changes its colour.

Answer 2

Answer:

It is because HCl gas is dry and there is no movement of ions in it. When litmus paper is moistened the gas becomes wet again and changes its colour.

Explanation:

Hcl gas gives H+ ions only in aqueous solution  so it will not split into H+ + Cl- in the dry litmus paper no reaction occur 

With wet litmus paper water acts as a carrier for  splitting the Hcl into H+ + Cl-

Then reaction occurs and turn the blue litmus into red 

Hope it helps you dear