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

In the redox reaction $xMnO + yPbO_2 + zHNO_3 \to HMnO_4 + Pb(NO_3)_2 + H_2O$,determine the values of $x, y,$ and $z$.

What is $A$ in the following reaction $2Fe^{3+}_{(aq)} + Sn^{2+}_{(aq)} \to 2Fe^{2+}_{(aq)} + A$?

Which of the following solutions will turn violet when a drop of lime juice is added to it?

In which reaction is there a change in the oxidation state?

Only $2 \ mL$ of $KMnO_4$ solution of unknown molarity is required to reach the end point of a titration of $20 \ mL$ of oxalic acid $(2 \ M)$ in acidic medium. The molarity of $KMnO_4$ solution should be . . . . . . . . . $M$.