Q37 / 160 · NTA Abhyas (NEET) 2020 · Chemistry · Solutions

What is the correct sequence of the increasing order of freezing point at one atmosphere of the following 0.01 M aqueous solution?
1. Urea, 2. Potassium chloride, 3. Potassium sulphate, 4. Potassium phosphate.
Select the correct answer using the codes given below

  • A
    3, 4, 1, 2
  • B
    3, 4, 2, 1
  • C
    4, 3, 1, 2
  • Correct answer
    D
    4, 3, 2, 1

Solution

vant Hoff factors for urea, KCl, K2SO4 and K3PO4 are 1, 2, 3 and 4 respectively.
As ΔTf∝im , so ΔTf for urea, KCl, K2SO4 and K3PO4 are proportional to 1, 2, 3 and 4 respectively. Hence, freezing point order is K3PO4<K2SO4<KCl< Urea

Hence, the correct answer is option: 'D'.

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