Sodium nitroprusside imparts a violet colour due to the formation of:

University of Ilorin CHM102 2025C past question

1. [Fe(CN)₅NOS]⁴⁻
2. [Fe(CN)₆]³⁻
3. [Fe(CN)₆]⁴⁻
4. [FeNO]²⁺

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