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When 20 ~g of naphthoic acid ( C ₁₁ H ₈ O ₂ ) is dissolved in 50 ~g of benzene (K_f=1.72 ~K ~kg ~mol ⁻¹ ) , a freezing point depression of 2 ~K is observed. The van't Hoff factor (i) is

Options

  1. A0.5
  2. B1
  3. C2
  4. D3

Correct answer

A. 0.5

Step-by-step solution

Actual molecular weight of napthoic acid ( C ₁₁ H ₈ O ₂ )=172 aligned Molecular mass (calculated ) & = 1000 . K_f w W . T_f & = 1000 1.72 20 50 2 & =344 aligned

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