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JEE Main levelOne or more correct optionsDifficulty 2 of 3so047

Which statements about relative lowering of vapour pressure for non-volatile solutes in a given solvent are correct?

  1. AIt does not depend on the chemical nature of a non-electrolyte solute
  2. BIt equals the mole fraction of the solute
  3. CA solution (complete dissociation) shows the same value as a glucose solution
  4. D glucose and urea solutions have the same value

Answer: A, B, D

The relative lowering is , which depends only on the number of moles of solute particles relative to solvent. Two non-electrolytes at the same molality have identical (statements 1, 2, 4). NaCl gives about twice as many particles as glucose at the same molality, so its value is larger and statement 3 is false. Answer: 1, 2 and 4.
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