Metal M is a light-red metal, which is soft, malleable, and ductile. It melts at 103 8 ∘ C . Because of its positive standard electrode potential it is insoluble in Hydrochloric acid and in dil H 2

Question

Metal M is a light-red metal, which is soft, malleable, and ductile. It melts at $103 8^{\circ} C$ . Because of its positive standard electrode potential it is insoluble in Hydrochloric acid and in dil $H_{2} SO_{4}$ although in the presence of Oxygen some dissolution might take place. The dilute $HNO_{3}$ dissolves metal readily. If coloured solution $MSO_{4}$ obtained by dissolving metal in conc. $H_{2} SO_{4}$ is treated with $KI (aq)$ solution an intense brown solution of triiodide is formed

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TestHub · Accepted Answer

Metal M is Copper because it is reddish, malleable, and has a high m.p. (~1038°C). It does not react with HCl or dilute H₂SO₄ due to positive E° value, but dissolves in HNO₃ and conc. H₂SO₄ forming Cu²⁺ (blue CuSO₄ solution). Cu²⁺ oxidizes I⁻ to I₂, which gives brown I₃⁻ solution with KI. Hence, M = Cu

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