Which of the following can act as both an oxidizing and a reducing agent?

When $Cl_2$ gas is passed through a hot and concentrated solution of $KOH$,which of the following compounds is formed?

$1 \ mole$ of $MnO_4^{2-}$ in neutral aqueous medium disproportionates to:

What will $1 \ mol$ of $MnO_4^{2-}$ produce upon disproportionation in a neutral aqueous medium?

$1 \text{ mole}$ of $MnO_4^{2-}$ disproportionates into $MnO_4^-$ and $MnO_2$ in an acidic medium. Calculate the percentage by mass of $Mn$ converted to $MnO_4^-$ (Molar mass of $Mn = 55 \ g/mol$).

Auto-oxidation of bleaching powder gives