State what do you observe when a piece of moist red litmus paper is placed in a gas jar containing ammonia.

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Solution

Basicity and Aqueous Solution of Ammonia $({NH}_{3})$ :
An aqueous solution of ammonia is basic in nature due to a lone pair of electrons on its nitrogen atom, i.e. it turns red litmus blue, methyl orange yellow and colourless phenolphthalein pink.
Therefore, when a piece of moist red litmus paper is placed in a gas jar containing ammonia, it turns blue.

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