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Question

In nitroprusside ion, the iron and NO exist as Fe+2 and NO+, instead of Fe+3 and NO. The given conclusion can be drawn by:

A
estimating the concentration of iron
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B
measuring the concentration of CN ion
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C
measuring the solid state magnetic moment
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D
thermally decomposing the compound
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Solution

The correct option is C measuring the solid state magnetic moment
The nitroprusside ion is [Fe(CN)6NO+]2. The solid state magnetic moment measurement reveals the presence of 4 unpaired electrons in Fe, which must be then in Fe2+(3d6), and not Fe3+(3d5).

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