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Question

When 20 g of naphthoic acid (C11H8O2) is dissolved in 50 g of benzene (Kf=1.72kgmol1), a freezing point depression of 2 K is observed. The Van’t Hoff factor (i) is 
  1. 0.5
  2. 1
  3. 2
  4. 3


Solution

The correct option is A 0.5
ΔTf=i×Kf×m

or 2=i×1.72×20172×150×1000
or i =0.5

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