Consider the following list of reagents:
Acidified $$K_2Cr_2O_7$$, alkaline $$KMnO_4, CuSO_4, H_2O_2, Cl_2, O_3, FeCl_3, HNO_3$$ and $$Na_2S_2O_3$$.
The total number of reagents that can oxidise aqueous iodide to iodine is
Correct Answer: 7
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