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In the nitroprusside ion, iron and NO are present as Fe2+ and NO+ instead of Fe3+ and NO. These two formulations can be distinguished by

1. determining the amount of iron present
2. estimating the concentration of CN−
3. measuring the magnetic moment in the solid state
4. thermally breaking down the compound

Correct answer: measuring the magnetic moment in the solid state

Solution

Fe2+(NO+) and Fe3+(NO) have different numbers of unpaired electrons, giving different magnetic moments. Measuring the magnetic moment in the solid state distinguishes the two formulations.

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