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Chemistry-Balancing Redox Reactions

NEET Chemistry Balancing Redox Reactions MCQ Question

Type: MCQ-diagram based-Medium-Class 11

Consider a diagram showing the half-reaction method for balancing redox reactions. If the oxidation half-reaction is 2I−→I2+2e−2I^- \rightarrow I_2 + 2e^- and the reduction half-reaction is MnO4−+2H2O+3e−→MnO2+4OH−MnO_4^- + 2H_2O + 3e^- \rightarrow MnO_2 + 4OH^-, what is the correct net balanced redox equation?

Question diagram
A

6I^- + 2MnO_4^- + 4H_2O →\rightarrow 3I_2 + 2MnO_2 + 8OH^-

B

4I^- + MnO_4^- + 2H_2O →\rightarrow 2I_2 + MnO_2 + 4OH^-

C

2I^- + MnO_4^- + H_2O →\rightarrow I_2 + MnO_2 + 2OH^-

D

3I^- + 2MnO_4^- + 2H_2O →\rightarrow 2I_3^- + Mn_2O_3 + 4OH^-

Correct Answer

Option A

Detailed Explanation

The correct answer is derived by multiplying the oxidation half-reaction by 3 and the reduction half-reaction by 2 to equalize electrons and then adding them. This results in the balanced equation: 6I^- + 2MnO_4^- + 4H_2O →\rightarrow 3I_2 + 2MnO_2 + 8OH^-.

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