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

  • A
    Two moles of sulphuric acid
  • B
    Two moles of peroxomonosulphuric acid
  • C
    One mole of sulphuric acid and one mole of peroxomonosulphuric acid
  • D
    One mole of sulphuric acid,one mole of peroxomonosulphuric acid,and one mole of hydrogen peroxide

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$O_2F_2$ is an unstable yellow-orange solid and $H_2O_2$ is a colourless liquid. Both have an $O-O$ bond. The $O-O$ bond length in $H_2O_2$ and $O_2F_2$ respectively is:

The correct statements from the following are:
$i$. $Ca(OH)_2$ is used in Clark's method of removal of temporary hardness of water.
$ii$. $100 \ mL$ of $10$ vol $H_2O_2$ on complete decomposition liberates $1 \ L$ of oxygen at $STP$.
$iii$. Urea can be added to the solution of $H_2O_2$ as stabilizer.

$H_2O_2$ cannot be used for which of the following purposes?

$1 \ mL$ of "$x$ volume" $H_2O_2$ solution on heating gives $20 \ mL$ of oxygen gas at $STP$. The $(w/v) \%$ corresponding to "$x$ volume" of $H_2O_2$ is

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