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In the nitroprusside ion the iron is present as Fe2+ and the nitrosyl group as NO+, rather than as Fe3+ and NO. This oxidation-state assignment is confirmed by:

1. magnetic moment measurement in the solid state
2. thermal decomposition method
3. reaction with KCN
4. reaction with K2SO4

Correct answer: magnetic moment measurement in the solid state

Solution

Fe2+ (low-spin d6) with NO+ is diamagnetic, whereas Fe3+ with neutral NO would be paramagnetic; the measured magnetic moment in the solid state settles which is correct.

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