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

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The colour of litmus paper changes only in the presence of ions like hydrogen (H^+) or hydronium (H_3O^+) ions. Dry HCl does not contain  (H^+) or (H_3O^+) ions. It can produce these ions only in the form of an aqueous solution.

Hence, because of that dry HCl gas does not change the colour of dry litmus paper.

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Gautam harsolia

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