NEET 2021 · ChemistryPrevious Year Question
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 solution]
Answer: (A) 336 mm of Hg. \textbf{Answer:} (A) 336 mm of Hg \textbf{Solution:} For an ideal solution Raoult's law gives the total vapour pressure as .
- A.336 mm of Hg✓
- B.350 mm of Hg
- C.160 mm of Hg
- D.168 mm of Hg
Correct Answer
(A) 336 mm of Hg
Solution & Explanation
\textbf{Answer:} (A) 336 mm of Hg \textbf{Solution:} For an ideal solution Raoult's law gives the total vapour pressure as . Mole fractions: , . mm Hg.
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