A and B are ideal gases. The molecular w...

A and B are ideal gases. The molecular weights of A and B are in the ratio of `1 : 4`. The pressure of a gas mixture containing equal weights of A and B is P atm. What is the partial pressure (in atm.) of B in the mixture

`( P)/( 5)`

`(P)/( 2)`

`( P)/( 2.5)`

`(3P)/( 4)`

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