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A solution of sodium in liquid ammonia is blue due to the presence of

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Na atoms

Ammonium ions

Solvated Na⁺ ions

Solvated electrons

answer is D.

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Detailed Solution

The alkali metals dissolve in liquid ammonia without the evolution of hydrogen. The colour of the dilute solutions is blue. The metal atom loses electron and it combines
with ammonia molecule.

M= alkali metal

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