Metal M is a light-red metal, which is soft, malleable, and ductile. It melts at 1038°C. Because of its positive standard

Question

Metal M is a light-red metal, which is soft, malleable, and ductile. It melts at 1038°C. Because of its positive standard electrode potential it is insoluble in hydrochloric acid and in dilute sulphuric acid, although in the presence of oxygen some dissolution might take place. Medium-concentrated nitric acid (8M) dissolves metal readily. If coloured solution MSO4 obtained by dissolving metal in conc. H2SO4 is diluted & treated by KI excess, precipitate of metal(I) iodide is formed, which is white, but the solution is intensely brown because of the formation of triiodide ions.
Select CORRECT regarding above information.
If a clean iron nail or a blade of a penknife is immersed in a solution of a metal salt, a red deposit of metal is obtained
Metal salt solution of "M" shows redox reaction with Na2S2O3
Solution obtained by reaction of metal "M" & AgNO3aq produce colorless solution with excess NH4OH
Oxide of metal M (i.e. MO) dissolves in dil. HCI but not in excess KOH

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