Hydrogen peroxide can be tested with

Options

A. A filter paper with a stain of black PbS
B. An acidified solution of `TiO_2`
C. `KI + ` starch solution
D. Acidified `K_2 Cr_2O_7` solution with little ether

Answer

A, B, C, D

Explanation

Hydrogen peroxide can be tested with
1) `H_2O_2` reacts with KI to form `I_2` which on reaction with starch producess blue colour solution
`H_2O_2 + 2KI to 2KOH + I_2 overset("startch")to` blue color
2) `H_2O_2` on reaction with acidified `K_2Cr_2O_7` forms blue ether and produces blue coloured layer.
3) `H_2O_2` gives oranges colour (pertitanic acid) on reaction with acidified titanium dioxide.
`TiO_2 + 2H_2SO_4 to Ti(SO_4)_2 + 2H_2O overset(H_2O_2)to H_2TiO_4 + 2H_2SO_4` Per titanic acids
4) `H_2O_2` turn black PbS into white substance `PbSO_4`