A metal M which is unreactive in air and moisture has two prominent oxidation states +1 and +3. in aqueous solution tends to disproportionate into
ions. This metal can be easily dissolved in a mixture of 3:1 mixture of concentrated hydrochloric and nitric acids. What is the M?
Pt
Ag
Cu
Au
Au has two oxidation states +1 and +3. in aqueous solution disintegrates into
. Also, Au dissolves in aqua regia.