COMEDK · Chemistry · 24. Coordination Compounds

The correct IUPAC name of the coordination compound \(\text{K}_3[\text{Fe}(\text{CN})_5\text{NO}_2]\) is

A potassium pentacyanonitrosylferrate (II)
B potassium pentacyanonitro-N-ferrate (III)
C potassium nitritopentacyanoferrate (IV)
D potassium nitritopentacyanoiron (II)

Verified Solution

Answer & Solution

Correct Answer

(B) potassium pentacyanonitro-N-ferrate (III)

Step-by-step Solution

Detailed explanation

Complex anion: \([Fe(CN)_5NO_2]^{3-}\). Let \(x\) be the oxidation state of Fe. \(x + 5(-1) + 1(-1) = -3\) \(x = +3\) Naming the ligands: 5 \(CN^-\) ligands \(\to\) pentacyano; 1 \(NO_2^-\) ligand coordinating through N \(\to\) nitro-N (alphabetically, cyano comes before nitro).…

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.

Same subject

[XY] mol / L	Rate of decomposition of XY mol / L s
0.4	\(5.5 \times 10^{-7}\)
0.8	\(22.0 \times 10^{-7}\)
1.2	\(49.5 \times 10^{-7}\)

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