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Experimentally it was found that a metal oxide has formula M 0.98 O. Metal M, is present as M 2+ and M 3+ in its oxide. Fraction of the metal which exists as M 3+ would be -

1. 6.05%
2. 5.08%
3. 7.01%
4. 4.08%

Correct answer: 4.08%

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