The product of oxidation of $I^-$ ion by $MnO_4^-$ in alkaline medium is

The acidic solution of $S_2O_3^{2-}$ is converted to ....... in the presence of $I_2$.

Which of the following is a redox reaction?

$KMnO_4$ reacts with $H_2O_2$ in an acidic medium. The number of moles of oxygen produced per mole of $KMnO_4$ is

What are $x, y$ and $z$ respectively in the following reaction?
$xFe^{2+}{_{\text{(aq)}}} + yH^{+}{_{\text{(aq)}}} + zCr_2O_7^{2-}{_{\text{(aq)}}} \rightarrow \frac{y}{2}H_2O_{\text{(l)}} + xFe^{3+}{_{\text{(aq)}}} + 2zCr^{3+}{_{\text{(aq)}}}$

The number of moles of acidified $KMnO_4$ required to convert one mole of sulphite ion into sulphate ion is