Question

what is the action of red litmus on the solution of ammonia gas in water?​

Answer 1

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When passed through the water, ammonia is converted to ammonium hydroxide. It dissociates to give hydroxyl ions and the solution is basic in nature. Red litmus acquires a blue colour.

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$NH_4OH(aq) ----> {NH_4}^{+}(aq) + {OH}^{-}(aq)$

As a result, ammonium hydroxide turns red litmus paper into blue.