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When sodium nitroprusside is introduced into an alkaline solution containing sulphide ions, a purple-coloured ion is formed. This colour is due to the formation of which species?

1. Na2[Fe(H2O)5NOS]
2. Na2[Fe(H2O)5NOS]
3. Na3[Fe(CN)5NOS]
4. Na4[Fe(CN)5NOS]

Correct answer: Na2[Fe(H2O)5NOS]

Solution

In alkaline medium, sulphide ions react with sodium nitroprusside to form a purple complex known as sodium thionitroprusside. This species is responsible for the characteristic colour in the test.

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