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Alkaline oxidative fusion of MnO 2 gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are

1. − 2 4 MnO and Mn 2 O 7
2. Mn 2 O 7 and − 4 MnO
3. Mn 2 O 3 and − 2 4 MnO
4. − 2 4 MnO and − 4 MnO

Correct answer: − 2 4 MnO and − 4 MnO

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