Chemistry - Complete s-block Question with Solution | TestHub

A paper dipped in PbS (black) turns white when brought in contact with${\mathrm{H}}_2{\mathrm{O}}_2$

It liberates iodine from KI solution which gives blue coloure with starch solution

It gives blue colour with${\mathrm{K}}_4\left[\mathrm{F}\mathrm{e}\right(\mathrm{C}\mathrm{N}{)}_6]$

It decolourises acidified$\mathrm{K}\mathrm{M}\mathrm{n}{\mathrm{O}}_4$solution