First slide

Balancing of redox reactions

Question

Consider the half reaction, ${MnO}_{4}^{-} \overset{{OH}^{-}}{\to} {MnO}_{2},$ Number of water molecules involved in the balanced half reaction is/are

Easy

A

1
B

2
C

3
D

4

Solution

${MnO}_{4}^{-} \to {MnO}_{2} + 2 H_{2} O; {MnO}_{4}^{-} + 4 H_{2} O \to {MnO}_{2} + 2 H_{2} O + 4 {OH}^{-}; {MnO}_{4}^{-} + 2 H_{2} O + 3 e^{-} \to {MnO}_{2} + 4 {OH}^{-};$

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