JAMB - Chemistry (2010 - No. 30)
To a solution of an unknown compound, a little dilute tetraoxosulphate (VI) acid was added with some freshly prepared iron (II) tetraoxosulphate (VI) solution. The brown ring observed after the addition of a stream of concentrated tetraoxosulphate (VI) acid confirmed the presence of?
CO\(^{2-}_{3}\)
Cl-
SO\(_{3}^{2-}\)
NO\(^{2-}_{3}\)
Forklaring
NO\(_{3}^{-}\) is confirmed, then the brown ring is due to the formation of FESO\(_4\).NO