Chemistry - Complete d-block Question with Solution | TestHub

A black solid(one of the component of residue) is obtained and is insoluble in water

One of the component of solid residue is soluble in water to form green solution

Acidification of green solution leads to precipitation of black solid

Release of gas by the decomposition of ${\mathrm{KMnO}}_4$ and the same gas is produced by the decomposition of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$