Dry hydrogen chloride gas does not turn blue litmus to red whereas hydrochloric acid does. Why?

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Solution

In hydrochloric acid solution, it gets dissociated to $H^{+}$ and $C l^{-}$ which makes it highly acidic, because of which litmus is turning red. But the similar thing doesn't happen in case of dry $H C l$ gas [no dissociation].

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