In alkaline medium,$MnO_4^{-}$ oxidises $I^{-}$ to:

For the balanced redox reaction $xMnO_4^- + yC_2O_4^{2-} + zH^+ \to Mn^{2+} + CO_2 + H_2O$,the values of $x, y$ and $z$ are respectively:

The number of electrons involved in the reduction of permanganate to manganese dioxide in acidic medium is $.......$.

Complete the following reactions:
$(a) \ Cr_2O_7^{2-} + X \to 2CrO_4^{2-} + H_2O$
$(b) \ Cr_2O_7^{2-} + 14H^+ + X \to 2Cr^{3+} + 7H_2O$
$(c) \ 6I^- \to X + 6e^-$

On balancing the given redox reaction,$aCr_2O_7^{2-} + bSO_3^{2-}{(aq)} + cH^{+}{(aq)}$ $\rightarrow 2aCr^{3+}{(aq)} + bSO_4^{2-}{(aq)} + \frac{c}{2}H_2O_{(l)}$,the coefficients $a$,$b$,and $c$ are found to be,respectively-

Assign $A, B, C, D$ from the given type of reaction for the following chemical equation:
$N_2 + 3H_2 \longrightarrow 2NH_3$