JEE Main 2026 · Session 2 · Shift 1 · Chemistry
Question 55
19.5 g of fluoro acetic acid (molar mass = 78 g mol⁻¹) is dissolved in 500 g of water at 298 K. The depression in the freezing point of water was 1°C. What is Kₐ of fluoro acetic acid? (For water, K_f = 1.86 K kg mol⁻¹). Assume molarity and molality to have same values.
- A. 10⁻⁶
- B. 4×10⁻⁴
- C. 3×10⁻⁵
- D. 3×10⁻³Correct answer
Not yet checked by a person: transcribed from the official question paper and matched against NTA’s official answer key by the question’s own ID on , never worked out independently. Spotted a mistake? Tell us and we’ll fix it. No explanation is published here yet.
Official source
Published by NTA. Last checked against this source on . Where the two disagree, the official notice is correct — tell us and we will fix it.
Question paper, page 22.