Chemistry - Salt Analysis Question with Solution | TestHub

P ($C{N}^{-}$): Forms AgCN precipitate with $AgN{O}_3$ (1). Forms $Cu(CN{)}_2$ precipitate and $Cu(CN{)}_4^{3-}$ complex with $C{u}^{2+}$ (2). Forms $Fe(CN{)}_6^{3-}$ complex with $F{e}^{3+}$ (3).

Q ($N{O}_2^{-}$): Forms $AgN{O}_2$ precipitate with $AgN{O}_3$ (1). Evolves NO gas with dil. $H_{2}S{O}_4$ (4). Oxidized by $KMn{O}_4$ (5).

R ($I^{-}$): Forms AgI precipitate with $AgN{O}_3$ (1). Oxidized by $KMn{O}_4$ (5).

S ($S_2{O}_3^{2-}$): Forms $A{g}_2{S}_2{O}_3$ precipitate with $AgN{O}_3$ (1). Forms $C{u}_2{S}_2{O}_3$ precipitate and $C{u}_6(S_2{O}_3{)}_5^{4-}$ complex with $C{u}^{2+}$ (2). Evolves $S{O}_2$ gas with dil. $H_{2}S{O}_4$ (4). Oxidized by $KMn{O}_4$ (5).

Therefore, the correct match is P $\to$ 1,2,3; Q $\to$ 1,4,5; R $\to$ 1,5; S $\to$ 1,2,4,5.