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JEE Main levelSingle correct optionDifficulty 2 of 3sb010

The blue colour of a dilute solution of sodium in liquid ammonia is due to

Aexcitation of $[Na (NH X_{3}) X_{x}] X^{+}$ in the visible region
Bexcitation of the ammoniated electron, which absorbs in the red region
Celectronic transitions in $NH X_{4} X^{+}$
Dformation of $NaNH X_{2}$

Answer: B

The solvated electron occupies a cavity in the solvent and absorbs light in the red region of the visible spectrum with a tail into the infrared. The transmitted light is blue. The cation has a noble gas configuration and is colourless, and

NaNH X_{2}

forms only slowly.

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