In which of the following compounds is a peroxide bond present?

$H_2O_2$ cannot oxidise

The strength in volumes of a solution containing $30.36 \ g/L$ of $H_2O_2$ is

The $pH$ of a solution of $H_2O_2$ is $6.0$. Some chlorine gas is bubbled into this solution. Which of the following is correct?

Fill in the blanks:
$(1)$ $H_2O_2$ acts as an antiseptic, then it is known as ......... in the market.
$(2)$ Cation exchange resin is a ......... group containing organic molecule.
$(3)$ The ionic radius of $H^+$ ions and that of other ions is ......... $pm$ and ......... $pm$ respectively.
$(4)$ ......... group elements give salt-like hydrides.

Write chemical reactions to justify that hydrogen peroxide $(H_{2}O_{2})$ can function as an oxidising as well as a reducing agent.