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To a solution of an unknown compound a little d... - JAMB Chemistry 2010 Question

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
A
CO-
B
Cl-
C
SO-
D
NO
correct option: d
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