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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