What happens when hydrogen peroxide is added to acidified potassium permanganate solution?

What happens when hydrogen peroxide is added to lead sulphide?

What happens when hydrogen peroxide is added to silver oxide?

What happens when ozone reacts with hydrogen peroxide?

What happens when hydrogen peroxide is added to acidified ferrous sulphate solution?

What happens when chromium hydroxide is treated with hydrogen peroxide in the presence of sodium hydroxide?

You have been given two liquids ($\mathrm{A}$) and ($\mathrm{B}$) made of the same atoms. Both are diamagnetic.

$\mathrm{Liquid} \mathrm{A}+\mathrm{KI}/{\mathrm{H}}^{+}+\mathrm{Starch}\to \mathrm{Blue} \mathrm{colour}$, liquid ($\mathrm{B}$) is neutral to litmus and also does not give the above test with starch. Identify ($\mathrm{A}$) and ($\mathrm{B}$).

Represent the following by chemical equations:

Alkaline ${\mathrm{Cr}}^{3+}$ salts are oxidized by ${\mathrm{H}}_2{\mathrm{O}}_2.$