What is the equivalent weight of $KMnO_4$ in acidic medium (in $g$)? (Molecular weight of $KMnO_4 = 158 \ g$)

When $CrI_3$ oxidises to $Cr_2O_7^{2-}$ and $IO_4^-$,the equivalent mass of $CrI_3$ will be :-

Reaction of $Br_2$ with $Na_2CO_3$ in aqueous solution gives sodium bromide and sodium bromate with evolution of $CO_2$ gas. The number of sodium bromide molecules involved in the balanced chemical equation is

Write the balanced chemical equation for the following reaction:
$Cl_2O_7$ in the gaseous state combines with an aqueous solution of hydrogen peroxide $(H_2O_2)$ in an acidic medium to give chlorite ion $(ClO_2^-)$ and oxygen gas $(O_2)$. (Balance by the ion-electron method)

What is the ratio of the stoichiometric coefficient of $N_2H_4$ to $Cl^-$ in the following balanced redox reaction?
$ClO_3^- + N_2H_4 \to NO_3^- + Cl^-$

In the neutral or faintly alkaline medium,$KMnO_4$ oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from?