Which of the following gives $H_2O_2$ on hydrolysis?

Which substance is currently used for the bleaching of paper?

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

Which of the following statements is incorrect?

How many millilitres of $20$ volume $H_2O_2$ solution is needed to react completely with $500 \ mL$ of acidified $1 \ N \ KMnO_4$ solution?

Given below are two statements:
Statement $I$: $H_{2}O_{2}$ can act as both an oxidising and a reducing agent in a basic medium.
Statement $II$: In the hydrogen economy,the energy is transmitted in the form of dihydrogen.
In the light of the above statements,choose the correct answer from the options given below: