$H_2O_2$ in basic medium reduces $I_2$ to form:

The structural formula of $H_2O_2$ is:

What is the gas liberated when alkaline formaldehyde solution is treated with $H_2 O_2$?

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?

$A$ colourless liquid $A$ contains $H$ and $O$ elements only. It decomposes slowly on exposure to light. It is stabilised by mixing urea to store in the presence of light.
$(i)$ Suggest the possible structure of $A$.
$(ii)$ Write the chemical equation for its decomposition reaction in light.

What is the order of $K_a$ for $H_2O_2$?