Freshly prepared pure dilute solution of sodium in liquid a…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) General Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Freshly prepared pure dilute solution of sodium in liquid ammonia :

shows copper - bronze colour.

occupy larger volume than that from the sum of the volumes of Na and NH 3 ( λ ).

reduces the GeH 4 to GeH 2 – .

produces sodium amide and hydrogen gas with rusty iron wire.

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(b,c,d)

The alkali metals dissolve in liquid ammonia giving blue solutions.

M + (x + y) NH 3 [M(NH 3 ) x ] + + [e(NH 3 ) y ] –

The blue colour, corresponding to a broad absorption band near 1500 nm that tails into the visible range, is attributed to the solvated electron.

According to the cavity concept, they occupy far greater volume than that expected from the sum of the volumes of metal and solvent.

The solution of metals in liquid ammonia act as powerful reducing agents (it even reduces the aromatic ring)

GeH 4 + e – → GeH 2 – + H 2 .

In the presence of impurities or transition metals like Fe ; MNH 2 and H 2 gas are formed.

M + NH 3 MNH 2 + H 2

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