MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistrySolutionsPrevious Year Questions
The correct option for the value of vapour pressure of a solution at 45 °C with benzene to octane in molar ratio 3 : 2 is: [At 45 °C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas] (NEET 2021)
A.336 mm of Hg✓ Correct
B.350 mm of Hg
C.160 mm of Hg
D.168 mm of Hg
Explanation
Let benzene is B and octane is O. XB = 3/5 = 0.6 XO = 2/5 = 0.4 Now, PT = PB₀XB + PO₀XO = 0.6(280) + 0.4(420) = 336 mm Hg
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