Fenton’s reagent is

Blackened oil painting can be restored into original form by the action of :

Assertion $:$ Amount of $H_2O_2$ in a sample can be determined by treating $H_2O_2$ solution with $KI$ and followed by titration of liberated $I_2$ with sodium thiosulphate.
Reason $:$ In this titration,an intense blue colour appears which disappears at the end point.

Which of the following yields $H_2O_2$ upon hydrolysis?

What is the amount of $H_2O_2$ in $gm$ present in $1 \, L$ of $1.5 \, N \, H_2O_2$ solution?

The $pH$ of an $H_2O_2$ solution is $6$. If some chlorine gas is passed through it,which of the following statements is correct?