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Balance the following equation using oxidation number method: 

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Balance the following equation using oxidation number method: 

MnO2 + Cl → Mn2+ + Cl2

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Assigning oxidation numbers:

Equating the increase and decrease in oxidation number:

MnO2 + 2Cl- → Mn2+ + Cl2

Balancing hydrogen and oxygen atoms:

MnO2 + 2Cl- + 4H+ → Mn2+ + Cl2 + 2H2O

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