Sodium nitroprusside, when added to an alkaline solution of
sulphide ions, produces purple colour ion due to the
formation of
(a) Na[Fe(H₂O)₅ NOS] (b) Na₂[Fe(H₂O)₅ NOS]
(c) Na₃[Fe(CN)₅NOS] (d) Na₄[Fe(CN)₅NOS]
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Answer:
(d) Na₄[Fe(CN)₅NOS]
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Na₄[Fe(CN)₅NOS] is the complex formed.
Explanation:
- Sodium nitroprusside is a chelation complex formed of iron and cyanide with nitro group chelation.
- Its normal colour is reddish brown.
- This complex, when added with an alkaline solution of sulphide, suppose sodium sulphide reacts with sulphide.
- This gives the thionitroprusside complex ion.
- It has the valency of 4.
- This complex has free electrons which absorb each and every colour except purple.
- So the colour of the complex becomes purple.
- The reaction is
- Na2S + Na₄[Fe(CN)₅NO] = Na₄[Fe(CN)₅NOS]
For more information about nitroprusside,
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