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Paragraph: Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to-day life. One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator automobiles. A solution M is p

Options

  1. A39.3 ~mm Hg
  2. B36.0 ~mm Hg
  3. C29.5 ~mm Hg
  4. D28.8 ~mm Hg

Correct answer

B. 36.0 ~mm Hg

Step-by-step solution

Total vapour pressure, p=p_A^ _A p=40 0.9=36 ~mm of Hg In the paragraph, it has been directed to take solute as non-volatile, thus H ₂ O do not contribute in the total vapour pressure.

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