Which one of the following reactions represents the oxidising property of $H_2O_2$?

Rohan heard that instructions were given to the laboratory attendant to store a particular chemical,i.e.,keep it in the dark room,add some urea in it,and keep it away from dust. This chemical acts as an oxidising as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents.
$(i)$ Write the name of this compound.
$(ii)$ Explain why such precautions are taken for storing this chemical.

Which of the following is incorrect regarding $H_2O_2$?

In the reaction of $BaO_2$ with dilute $H_2SO_4$,what are the oxidation states of the most electronegative element in the products?

Hydrolysis of one mole of peroxodisulphuric acid $(H_2S_2O_8)$ yields:

$(i)$ Give a method for the manufacture of hydrogen peroxide and explain the reactions involved therein.
$(ii)$ Illustrate oxidising,reducing and acidic properties of hydrogen peroxide with equations.