Formation of \({\mathrm{Na}}_{4}\left[\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NOS}\right]\), a purple coloured complex for…

Formation of \({\mathrm{Na}}_{4}\left[\mathrm{Fe}(\mathrm{CN}{)}_{5}\mathrm{NOS}\right]\), a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate extract of salt indicates the presence of :

[JEE Main 2025, 2 Apr (Shift 2)]