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NTA Abhyas JEE Main2020ChemistrySolutionsPractice

What is the correct sequence of the increasing order of freezing points at one atmosphere of the following 1.0 M aqueous solution? 1 . Urea, 2 . Sodium chloride, 3 . Sodium sulphate, 4 . Sodium phosphate. Select the correct answer using the codes given below

Options

  1. A4, 3, 1, 2
  2. B3, 4, 2, 1
  3. C3, 4, 1, 2
  4. D4, 3, 2, 1

Correct answer

D. 4, 3, 2, 1

Step-by-step solution

vant Hoff factors for urea, NaCl, N a 2 S O 4 and N a 3 P O 4 are 1, 2, 3 and 4 respectively. As Δ T f ∝ i m , so Δ T f for urea, NaCl, N a 2 S O 4 and N a 3 P O 4 are proportional to 1, 2, 3 and 4 respectively. Hence, freezing point order is N a 3 P O 4 < N a 2 S O 4 < N a C l < Urea

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