Question

A colourless water soluble solid \( A \) on heating gives equimolar quantities of \( B \) and \( C \). B gives dense white fumes with HCl and C does so with NH\(_3\). B gives brown precipitate with Nessler’s reagent and C gives white precipitate with nitrates of \( Ag^+ \), \( Pb^{2+} \) and Hg\(^{2+} \). A is

• A. \( NH_4Cl \)
• B. \( NH_4NO_3 \)
• C. \( NH_4CO_3 \)
• D. \( FeSO_4 \)

Hint:

The chemical behavior of ammonium salts includes producing white fumes with HCl and reacting with Nessler’s reagent to form a brown precipitate.

Answer 1

The Correct Option is A

The compound \( NH_4Cl \) reacts as described in the question. It gives dense white fumes with HCl and reacts with Nessler’s reagent to give a brown precipitate, characteristic of ammonium salts.