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

Which of the following statements is correct?

Which of the following molecules can act as an oxidizing as well as a reducing agent?

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.

By which of the following methods,$H_2O_2$ cannot be synthesized?

Electrolysis of $X$ gives $Y$ at anode. Vacuum distillation of $Y$ gives $H_2O_2$. The number of peroxy $(O-O)$ bonds present in $X$ and $Y$ respectively are :