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The combustion of sodium in excess air y...

The combustion of sodium in excess air yields a higher oxide.What is the oxidation state of the oxygen in the product ?

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The correct Answer is:
1
`4Na+O_2 to 2Na_2O, Na_2O +1/2 O_2 to Na_2O_2`
It exists as `2Na^+` and `O_2^(2-)` So oxidation state of O is -1.
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