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JEE Main levelSingle correct optionDifficulty 2 of 3sb055

Which statement is correct for a concentrated solution (above about ) of an alkali metal in liquid ammonia?

  1. AIt is deep blue, paramagnetic and a poor conductor.
  2. BIt is deep blue and strongly paramagnetic.
  3. CIt is colourless and non-conducting.
  4. DIt is bronze coloured, diamagnetic and conducts like a metal.

Answer: D

At high concentration the ammoniated electrons pair up (and cluster), so the solution becomes diamagnetic, loses the blue colour and acquires a bronze metallic lustre. Its conductivity is comparable to that of a metal. The blue paramagnetic form is the dilute solution.
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