An unknown, colorless gas 'X' turns moist red litmus paper blue. It produces dense white fumes when brought near a glass rod dipped in concentrated . Furthermore, passing gas 'X' through alkaline yiel

Question

An unknown, colorless gas 'X' turns moist red litmus paper blue. It produces dense white fumes when brought near a glass rod dipped in concentrated $HCl$. Furthermore, passing gas 'X' through alkaline $K_2HgI_4$ yields a distinct brown precipitate. Gas 'X' is definitively identified as:

Prashant Kotian · Accepted Answer

Correct answer: D. Turning red litmus blue indicates a basic gas. Forming white fumes with confirms the formation of . The brown precipitate with alkaline (Nessler's reagent) is the ultimate confirmation for Ammonia ().

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