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ChemistryJEE Main 2 Apr 2026, Shift 1·Q5·MCQ·Moderate

Solutions · Freezing point depression and dissociation

19.5 g of fluoro acetic acid (molar mass = 78 g mol−1^{-1}) is dissolved in 500g of water at 298 K. The depression in the freezing point of water was 1∘^\circC. What is KaK_\mathrm{a} of fluoro acetic acid ?

(For water, Kf=1.86K_\mathrm{f} = 1.86 K kg mol−1^{-1}). Assume molarity and molality to have same values.

  1. (1)10−610^{-6}
  2. (2)4×10−44\times10^{-4}
  3. (3)3×10−53\times10^{-5}
  4. (4)3×10−33\times10^{-3}

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See the full 2 Apr 2026, Shift 1 paper