On shaking $H_2O_2$ with acidified potassium dichromate and ether,the ethereal layer becomes:

Describe the structure of hydrogen peroxide $(H_2O_2)$.

$H_2O_2$ will oxidise:

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.

$A$ sample of $H_2O_2$ solution has a volume of $100 \, cm^3$ and it produces $1000 \, cm^3$ of $O_2$ gas at $STP$. What is the volume strength of the given $H_2O_2$ sample?

Reaction $H_2S_2O_{8(aq)} \xrightarrow{H_2O} 2H_2SO_4 + x.$ What is product $x$?