A coloured compound

CHEMISTRY · Single correct · CBSE · Chemistry · d- and f-Block Elements · d- and f-Block Elements

Problem

A coloured compound (A) reacts with dilute H2SO4\text{H}_2\text{SO}_4 to produce a colourless gas (B) and colourless solution (C). The reaction between (B) and the acidified K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7 solution produces a green solution and a slightly yellowish precipitate (D). The substance (D) burns in air to produce a gas (E) which also can change the colour of K2Cr2O7\text{K}_2\text{Cr}_2\text{O}_7 solution. When colourless solution (C) reacts with Pb3O4/H+\text{Pb}_3\text{O}_4/\text{H}^+ , it acquires a violet red colour due to formation of: (1) MnO4−\text{MnO}_4^- (2) PbO2\text{PbO}_2 (3) I3−\text{I}_3^- (4) [Ni(en)3]S2O3[\text{Ni}(\text{en})_3]\text{S}_2\text{O}_3

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