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A mixture of C(3)H(8) and CH(4) exerts a...

A mixture of `C_(3)H_(8)` and `CH_(4)` exerts a pressure of 320 mm Hg at temperature T K in a V litre flask. On complete combustion, gaseous mixture contains `CO_(2)` only and exerts a pressure of 448 mm Hg under identical conditions. Hence mole fraction of `C_(3)H_(8)` in the mixture is

A

`0.35`

B

`0.5`

C

`0.2`

D

`0.4`

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