AP EAMCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
A pungent smelling gas \(A\) gives dense white fumes with conc. \(\mathrm{HCl}\). When \(A\) reacts with alkaline solution of a colourless reagent \(B\), a reddish-brown precipitate \(C\) is formed. The compounds \(A, B, C\) respectively are
- A \(\mathrm{NO}_2, \mathrm{NaOH},\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NO}\right]^{2+}\)
- B \(\mathrm{NH}_3, \mathrm{NaOH}, \mathrm{K}_2 \mathrm{Hgl}_4\)
- C \(\mathrm{NH}_3, \mathrm{~K}_2 \mathrm{Hgl}_4, \mathrm{NH}_2, \mathrm{HgO}, \mathrm{Hgl}\)
- D \(\mathrm{Cl}_2\), Sodium nitroprusside, \(\left[\mathrm{Na}_2 \mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]\)
Answer & Solution
Correct Answer
(C) \(\mathrm{NH}_3, \mathrm{~K}_2 \mathrm{Hgl}_4, \mathrm{NH}_2, \mathrm{HgO}, \mathrm{Hgl}\)
Step-by-step Solution
Detailed explanation
Ammonia gas reacts with hydrogen chloride gas to form dense white fumes of ammonium chloride. This is used as a test to detect the presence of ammonia gas as per the reaction. \(\mathrm{NH}_3(g)+\mathrm{HCl}(g) \longrightarrow \mathrm{NH}_4 \mathrm{Cl}(s)\) Nessler's reagent is…
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