sblock Elements - Result Question 32

####42. Highly pure dilute solution of sodium in liquid ammonia

(a) shows blue colour

(b) exhibits electrical conductivity

(c) produces sodium amide

(d) produces hydrogen gas

(1998,2M)

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Answer:

Correct Answer: 42. (a,b)

Solution:

  1. In dilute solution of Na in liquid ammonia, solvated electrons are present whose emission spectrum gives blue colouration to solution.

Na+NH3Na++NH3(e) Solvated electron 

Also, presence of solvated electrons and solvated Na+ion makes solution highly conducting.



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