1.

Freshly prepared solution of sodium nitroprusside is added to the sodium extract. Appearance of a deep violet colour indicates the presence of

Answer»

nitrogen
sulphur
both nitrogenn and sulphur
halogen

Solution :`Na_(2)S+ UNDERSET("Sod nitroprusside")(Na_(2)[Fe(CN)_(5)(NO)])to underset("Sod. Thionitroprusside (VIOLET)")(Na_(4)[Fe(CN)_(5)(NOS)])`


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