JAMB Chemistry 2010 Objective — Question 31
Question 31 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2010 Objective paper, with the correct answer and a full explanation.
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31. 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. SO4 2- B. NO3- C. CO3 2- D. Cl-
- A. SO4 2-
- B. NO3-Correct
- C. CO3 2-
- D. Cl-
Explanation
This illustrates the brown ring test, which is a test that confirms the presence of NO3- (trioxonitrate(V)).
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