A white, sublimable inorganic substance gives a brown precipitate on treatment with Nessler's reagent and a white precipitate (soluble in NH3) with an AgNO3 solution. The substance is:

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Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: The white, sublimable substance must contain ions that sublimate, such as ammonium (NH4+) or mercury(I)/mercury(II) chlorides. Step 2: The substance gives a brown precipitate with Nessler's reagent, which is highly specific for ammonium ions (NH4+). It also gives a white precipitate with silver nitrate (AgNO3) that dissolves in ammonia, indicating chloride (Cl-). Step 3: Combining these, the substance is ammonium chloride (NH4Cl), which is a well-known sublimable salt, corresponding to option (d).

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