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InterviewSolution
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According to IUPAC nomenclature sodium nitroprusside is named asA. sodium pentacyanonitrosyl ferrate (II)B. sodium pentacyanonitrosyl ferrate (III)C. sodium nitroferricyanideD. sodium nitroferrocyanide |
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Answer» Correct Answer - B NO readily forms coordination complexes with transition metla bions. These complex are called nitrosyls. `F^(2+)` and NO form the complex `[Fe(H_(2)O)_(5)NO]^(2+)` which is responsible for the colour in the brown ring test for nitrates. The color is due to change transfer. This complex formally constains `Fe (+1)` and `NO^(+)` . Its magnetic moment is approximately `3.9` BM, confirming the presence of three - unpaired electrons. Note that `NO^(+)` is a strong field ligand, thus, it reshuffles the electronic configuration: `Fe^(+) (3d^(6) 4s^(1)) rarr Fe+ (3d^(7) 4s^(0))` Most nitrosyl complexes are colourd. Another example is sodium nitroprusside `Na_(2)[Fe(CN)_(5)NO]` . `2H_(2)O` . The colour (brown - red) is again due to charge transfer. This complex has `NO^(+)` as a ligands and `Fe^(+)` as the central metal ion. Thus, its IUPAC name should be sodium pentacyanidonitrosonium ferrat (II). As no such option is given, we gop for second option assuming NO to be a neutral ligand. |
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