$H_2O_2$ is always stored in black bottles because

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A:$ The dihedral angle in $H_{2}O_{2}$ in the gaseous phase is $90.2^{\circ}$ and in the solid phase is $111.5^{\circ}$.
Reason $R:$ The change in dihedral angle in the solid and gaseous phases is due to the difference in the intermolecular forces.
Choose the most appropriate answer from the options given below for $A$ and $R$.

$H_2O_2$ can be used as:

Which substance does not speed up the decomposition of $H_2O_2$?

In basic medium,$H_{2}O_{2}$ exhibits which of the following reactions?
$A$. $Mn^{2+} \rightarrow Mn^{4+}$
$B$. $I_{2} \rightarrow I^{-}$
$C$. $PbS \rightarrow PbSO_{4}$
Choose the most appropriate answer from the options given below:

The reaction $H_2S + H_2O_2 \to S + 2H_2O$ manifests: