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JEE Main · 2022 · 28 Jul 2022 · Shift 1 · s-Block Elements

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Which of the following statement is incorrect ?
  1. (A)Low solubility of LiF in water is due to its small hydration enthalpy.✓ Correct
  2. (B) is paramagnetic.
  3. (C)Solution of sodium in liquid ammonia is conducting in nature.
  4. (D)Sodium metal has higher density than potassium metal

Answer: (A)

Solution

LiF has low solubility in water because of its very high lattice enthalpy, not small hydration enthalpy. The high lattice energy is not sufficiently compensated by the hydration enthalpy. The other statements are correct: (potassium superoxide) is paramagnetic due to unpaired electrons, sodium in liquid ammonia forms a conducting solution due to solvated electrons, and sodium (0.97 g/cm³) is denser than potassium (0.86 g/cm³).

JEE Main · 2022 · 28 Jul 2022 · Shift 1 · Single correct option

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