$KMnO_4$ oxidises hydrogen sulphide in acidic medium. The number of moles of $KMnO_4$ which react with one mole of hydrogen sulphide is

The values of coefficients to balance the following reaction are
$Cr(OH)_3 + ClO^{-} + OH^{-} \to CrO_4^{2-} + Cl^{-} + H_2O$
Find the coefficients for $Cr(OH)_3$,$ClO^{-}$,$CrO_4^{2-}$,and $Cl^{-}$ respectively.

What is the number of electrons transferred considering $Mn$ when $KMnO_4$ is converted into $Mn_2O_3$?

Assign $A, B, C, D$ from the given type of reaction.
$Cr_2O_7^{2-} + H^{+} + SO_3^{2-} \longrightarrow Cr^{3+}(aq.) + SO_4^{2-}$

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$3PbS \downarrow + 8HNO_3(dil.) \longrightarrow 3Pb(NO_3)_2 + 3S + 2NO \uparrow $

In acidic medium,iodide $(I^{-})$ is oxidized to iodine $(I_2)$ by $KMnO_4$. What is the change in the oxidation number of manganese in this reaction?