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Solutions question

2005 · Shift 0 · Q19
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Solutions question

2005 · Shift 0 · Q19

JEE MainChemistrySolutionsMCQ+4 / −1
Equimolar solutions in the same solvent have
  1. A
    Same boiling point but different freezing point
  2. B
    Same freezing point but different boiling point
  3. C
    Same boiling and same freezing points
  4. D
    Different boiling and different freezing points
View written solutionFree

Correct answer: C

  1. For dilute solutions, the colligative properties depend on the number of solute particles present, not on their chemical nature.

  2. The relevant relations are: ΔTb=iKbm\Delta T_b = i K_b mΔTb​=iKb​m ΔTf=iKfm\Delta T_f = i K_f mΔTf​=iKf​m where:

  • ΔTb\Delta T_bΔTb​ = elevation in boiling point
  • ΔTf\Delta T_fΔTf​ = depression in freezing point
  • iii = van’t Hoff factor
  • Kb,KfK_b, K_fKb​,Kf​ = constants for the same solvent
  • mmm = molality

  1. The question says equimolar solutions in the same solvent. For such standard JEE-level questions, this implies same concentration of solute particles in the same solvent.

  2. Since the solvent is the same, KbK_bKb​ and KfK_fKf​ are the same. For equimolar solutions, the colligative effects are the same, so:

  • boiling point elevation is same
  • freezing point depression is same

Hence, the resulting boiling points are same and the freezing points are also same.

  1. Therefore, the correct option is: C: Same boiling and same freezing points\boxed{\text{C: Same boiling and same freezing points}}C: Same boiling and same freezing points​
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