In the thermal decomposition of a metal carbonate,the oxidation state of the metal changes if the metal is

What will be the value of $x$ and $y$ by balancing the reaction
$C_2H_5OH + xI_2 + yOH^{-} \to CHI_3 + HCO_2^- + 5I^{-} + 5H_2O$

Chlorine undergoes disproportionation in alkaline medium as shown below:
$a Cl_{2(g)} + b OH^{-}_{(aq)} \rightarrow c ClO^{-}_{(aq)} + d Cl^{-}_{(aq)} + e H_2O_{(l)}$
The values of $a, b, c$ and $d$ in a balanced redox reaction are respectively:

How many electrons are involved in the following redox reaction?
$Cr_2O_7^{2-} + Fe^{2+} + C_2O_4^{2-} \to Cr^{3+} + Fe^{3+} + CO_2$ (Unbalanced)

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$CuSO_4 + Zn_{(s)} \longrightarrow ZnSO_4 + Cu$

The number of moles of $KMnO_4$ reduced by one mole of $KI$ in alkaline medium is