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

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Solution

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

Answer: The colour of litmus paper changes only in the presence of ions like hydrogen (H⁺) or hydronium (H₃O⁺) ions. 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

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