JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Highly pure dilute solution of sodium in liquid ammonia:

(A)Shows blue colourCorrect
(B)Do not exhibit electrical conductivity
(C)Produces sodium amide
(D)Produces hydrogen gas

Answer: (A)

Solution

A dilute solution of sodium in liquid ammonia shows a characteristic deep blue colour, attributable to solvated (ammoniated) electrons: Na+(x+y)NH_3 \to [Na(NH_3)_x]^++[e(NH_3)_y]^-. This solution is in fact highly conducting due to the mobile solvated electrons

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Question ID VK-137831