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According to IUPAC nomenclature sodium nitroprusside is named as

1. Sodium pentacyanonitrosyl ferrate (III)
2. Sodium nitroferrocyanide
3. Sodium nitroferricyanide
4. Sodium pentacyanonitrosyl ferrate (II)

Correct answer: Sodium pentacyanonitrosyl ferrate (II)

Solution

The correct IUPAC name for sodium nitroprusside is Sodium pentacyanonitrosyl ferrate (II), as it contains a nitrosyl group and iron in the +2 oxidation state.

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