CSEC Chemistry · May/June 2015 · Paper 1 · Question Q26
A solution, X, is added to acidified aqueous potassium iodide which turns brown. Addition of starch to the solution results in a dark blue colouration. It is possible that solution X contains
- (A)
\text{Fe}^{2+}\text{ ions} - (B)
\text{SO}_3^{2-}\text{ ions} - (C)a reducing agent
- (D)an oxidizing agent
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