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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. A268.7 ~K
  2. B268.5 ~K
  3. C234.2 ~K
  4. D150.9 ~K

Correct answer

D. 150.9 ~K

Step-by-step solution

Solution M is mixture of ethanol and water. Mole fraction of ethanol is 0.9 Solvent is C ₂ H ₅ OH Mole fraction of water is 0.1 H ₂ O is solute Molality of H ₂ O = n₂ n₁ M₁ = 0.1 0.9 46 1000=2.415 T_f=k_f m=2 2.415=4.83 or Freezing point of solution =155.7-4.83=150.87 ~K

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