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Sodium nitroprusside reacts with Na₂S (formed from sulphur) to produce a violet color in Lassaigne’s test.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Structural Isomerism - Chain Position Functional Metamerism
Sulphur forms Na₂S in Lassaigne’s test, which reacts with sodium nitroprusside to give a violet-colored complex, Na₄[Fe(CN)₅NOS].
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism
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