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CBSE Class 10 Science Question 22 of 34

Acids, Bases and Salts — Question 3

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Question 3

Why does dry HCl gas not change the colour of the dry litmus paper?

Answer

The colour of litmus paper changes only in presence of ions like hydrogen [H+] or hydronium ions [H3O+]. HCl can produce these ions only in the form of aqueous solution. Hence, dry HCl gas does not change the colour of dry litmus paper.