COMEDK · Chemistry · 11. s Block Elements

Sodium dissolves in liquid \(\mathrm{NH}_{3}\) to give a deep blue solution. This is due to

A ammoniated \(\mathrm{Na}^{+}\)
B ammoniated \(\mathrm{Na}^{-}\)
C formation of \(\mathrm{Na}^{+} / \mathrm{Na}^{-}\)pair
D ammoniated electrons

Verified Solution

Answer & Solution

Correct Answer

(D) ammoniated electrons

Step-by-step Solution

Detailed explanation

\(\mathrm{Na}+(x+y) \mathrm{NH}_{3} \longrightarrow\left[\mathrm{Na}\left(\mathrm{NH}_{3}\right)_{x}\right]^{+}+\left[e\left(\mathrm{NH}_{3}\right)_{y}\right]^{-}\). The deep blue colour of the solution is due to the ammoniated electron which absorbs energy in the visible region…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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