Question

dry HCL gas does not turn blue Litmus Paper red where is hydrochloric acid does why?​

Answer 1

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In dry state, hydrogen chloride does not release any H+ ions. Therefore, it cannot behave as an acid. When dissolved in water, it forms hydrochloric acid which is written as HCl(aq). It dissociates to give H+ ions in solution. Therefore, it turns blue litmus paper into red litmus paper.

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$HCl(aq) ----> {H}^{+}(aq) + {Cl}^{-}(aq)$