In Lassaigne’s test, the presence of sulphur is confirmed by the formation of a violet color with which reagent?
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