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NEET2021ChemistrySolutionsActual

The correct option for the value of vapour pressure of a solution at 45 º 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]

Options

  1. A160   mm of Hg
  2. B168   mm of Hg
  3. C336   mm of Hg
  4. D350   mm of Hg

Correct answer

C. 336   mm of Hg

Step-by-step solution

Given: P B ° = 280   mm of Hg ,   P o ° = 420   mm of Hg X B = 3 5 and X o = 2 5 We know that according to Raoult's Law P T = X B P B ° + X o P o ° = 3 5 × 280 + 2 5 × 420 = 336   mm of Hg

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