Verified Solution • 2025–26 Session moderate

QJEEM19Ch277c: JEE Main 2019 Chemistry - Class 12 JEEM19Ch277c Solution: Molal depression constant for a solvent is 4.0 kg mol –1 . The…

Molal depression constant for a solvent is 4.0 kg mol–1. The depression in the freezing point of the solvent for 0.03 mol kg–1 solution of K2SO4 is :
(Assume complete dissociation of the electrolyte)

Multiple Choice Options

  • A 0.18 K
  • B 0.24 K
  • C 0.36 K
  • D 0.12 K

Step-by-Step Verified Solution

K2SO4 →\to 2K+ + SO42-

Van’t Hoff Factor (i) = 3

∴\therefore Δ\Delta Tf = ikfm

= 3 ×\times 4 ×\times 0.03 = 0.36 K

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