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Certain amount of oxygen gas was passed ...

Certain amount of oxygen gas was passed over heated carbon, where 80% of oxygen added was converted into CO gas, as per reaction
`2C(s)+O_(2)(g)rarr2CO(g)`
If gaseous mixture left is allowed to effuse, then, ratio of rate of effusionof CO to `O_(2)` will be:

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The correct Answer is:
b
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