JEE Main 2025 Chemistry question
Formation of Na_4[Fe(CN)_5NOS], a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of
Answer: (2)
Solution
S^{2-} + Na_2[Fe(CN)_5NO] \to [Fe(CN)_5NOS]^{4-} (deep violet compound), test for sulphide.