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In a flask at a certain temperature ...

In a flask at a certain temperature , there are 2g `H_(2) and 8 g O_(2) ` the mole fraction of `H_(2) ` in the given mixture is _____

A

`0.4`

B

`0.8`

C

`0.2`

D

`1.25`

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The correct Answer is:
B
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