In this Chemistry question, the solution Q that reacts with aqueous sodium hydroxide to produce ammonia gas changing the color of red litmus paper is Ammonium sulphate.
Solution Q reacted with aqueous sodium hydroxide producing a gas that changed the color of red litmus paper. The gas produced in this reaction is ammonia (NH3). Therefore, the solution Q that could have been used in this reaction is Ammonium sulphate (NH4)2SO4, represented in option A.
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