Question

Complete the following reactions.

(i) $MnO_{4}^{-} + 2H_{2}O + 3e^{-} \rightarrow \_\_\_\_\_\_ + 4OH^{-}$

(ii) $MnO_{4}^{-} + 8H^{+} + 5e^{-} \rightarrow \_\_\_\_ + 4H_{2}O$

(iii) $MnO_{4}^{-} + e^{-} \rightarrow \_\_\_\_\_$

• A. $MnO_{2},Mn^{2 +},MnO_{4}^{2 -}$
• B. $Mn^{2 +},MnO_{2},MnO_{4}^{2 -}$
• C. $MnO_{4}^{2 -},Mn^{2 +},MnO_{2}$
• D. $MnO_{2},MnO_{4}^{2 -},Mn^{2 +}$

Answer 1

Answer: (A)

$MnO_{2},Mn^{2 +},MnO_{4}^{2 -}$

Answer 2

$MnO_{2},Mn^{2 +},MnO_{4}^{2 -}$