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Chemistry · PYQ NEET UG 2020

हिन्दी

The freezing point depression constant (\( K_f \)) of benzene is \( 5.12\text{ K kg mol}^{-1} \). The freezing point depression for the solution of molality \( 0.078\text{ m} \) containing a non-electrolyte solute in benzene is (rounded off upto two decimal places):

  1. \( 0.80\text{ K} \)
  2. \( 0.40\text{ K} \)
  3. \( 0.60\text{ K} \)
  4. \( 0.20\text{ K} \)

Correct answer · Option 2

\( 0.40\text{ K} \)

Explanation

\( \Delta T_f = K_f \times m = 5.12 \times 0.078 = 0.39936\text{ K} \approx 0.40\text{ K} \).
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