A colourless water soluble solid 'X' on heating gives equimolar quantities of Y and Z. Y gives dense white fumes HCl and Z does so with NH3. Y gives brown precipitate with Nessler's reagent and Z give

Question

A colourless water soluble solid 'X' on heating gives equimolar quantities of Y and Z. Y gives dense white fumes HCl and Z does so with NH3. Y gives brown precipitate with Nessler's reagent and Z gives white precipitate with nitrates of Ag+, Pb2+ and Hg+. 'X' is:

Prashant Kotian · Accepted Answer

Correct answer: A. Step 1: Identify compound Y. Y is a gas that reacts with HCl to produce dense white fumes (NH4Cl) and forms a brown precipitate with Nessler's reagent, identifying it as ammonia (NH3). Step 2: Identify compound Z. Z is a gas that reacts with NH3 to form white fumes and precipitates Ag+, Pb2+, and Hg+ as white chlorides from aqueous solutions, identifying it as hydrogen chloride (HCl). Step 3: Reconstruct solid 'X'. Thermal decomposition of 'X' yields equimolar NH3 and HCl. Therefore, solid 'X' is ammonium chloride (NH4Cl), matching option (a).

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