JEE Main · ChemistryHard

When sodium metal is dissolved in liquid ammonia, the solution turns blue and becomes conducting. Which of the following statements is false regarding this solution?

  1. A.The blue color is due to the presence of ammoniated electrons, .
  2. B.The solution is paramagnetic due to the presence of unpaired electrons.
  3. C.On standing, the blue color persists indefinitely even if impurities are present.
  4. D.The solution reacts with water to liberate hydrogen gas.
Show correct answer & step-by-step solution

Correct answer: C — On standing, the blue color persists indefinitely even if impurities are present.

Solution

  1. The dissolution of sodium in liquid ammonia produces ammoniated cations and ammoniated electrons: .
  2. The ammoniated electrons absorb light in the visible region, giving the solution its characteristic blue color.
  3. In the presence of impurities like transition metal ions, the solution decomposes to form metal amide and hydrogen gas, causing the blue color to fade.
  4. Hence the answer is (C).

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