In the reaction,$2KMnO_4 + 16HCl \rightarrow 5Cl_2 + 2MnCl_2 + 2KCl + 8H_2O$,the reduction product is

In the reaction $H_2S + Cl_2 \to S + 2HCl$,which species undergoes oxidation?

Addition of iron filings to $CuSO_4$ solution causes the precipitation of $Cu$ due to the:

In which process does the nitrogen undergo oxidation?

Which of the following changes involves the transfer of $5$ electrons?

In the reactions given below,identify the species undergoing oxidation and reduction:
$(i)$ $H_{2}S_{(g)} + Cl_{2(g)} \rightarrow 2HCl_{(g)} + S_{(s)}$
$(ii)$ $3Fe_{3}O_{4(s)} + 8Al_{(s)} \rightarrow 9Fe_{(s)} + 4Al_{2}O_{3(s)}$
$(iii)$ $2Na_{(s)} + H_{2(g)} \rightarrow 2NaH_{(s)}$