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Q.

The alkali metals dissolve in liquid ammonia. It is observed that

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a

the blue colour is due to the presence of solvated electrons

b

the blue solutions are paramagnetic and reducing agents

c

all the above facts are correct

d

the dilute solutions are blue but the colour changes to bronze with increasing concentration

answer is D.

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Detailed Solution

  • When alkali metals dissolved liquid ammonia to form blue color solution. 
  • Dilute solutions are paramagnetic due to free ammoniated electrons.
  • As we increase concentration, association of solvated electrons get started and para magnetism decreases and color changes to bronze.
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