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The correct option for the value of vapour pressure of a solution at $45^\circ C$ with benzene to octane in molar ratio 3 : 2 is: [At $45^\circ C$ vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
A
168 mm of Hg
B
336 mm of Hg
C
350 mm of Hg
D
160 mm of Hg