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On subjecting 10ml mixture of N(2) and C...

On subjecting 10ml mixture of `N_(2)` and CO to repeated electric spark to form `CO_(2)` and NO, 7 ml of `O_(2)` was required for combustion. What was the mole precent of CO in the mixture ? (All volumes were measured under identical conditions)

A

60

B

40

C

6

D

4

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The correct Answer is:
A
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