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

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

A

`0.2`

B

`0.8`

C

`0.25`

D

`0.75`

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