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Consider the following list of reagents :
Acidified $K_{2} C r_{2} O_{7}$ , alkaline $K M n O_{4}, C u S O_{4}, H_{2} O_{2}, C l_{2} (1 m o l e), O_{3}, F e C l_{3}, H N O_{3}$ (dil) and $N a_{2} S_{2} O_{3}$ . The total number of reagents that can oxidise aqueous iodide to iodine is

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answer is 7.

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Detailed Solution

Acidified $K_{2} C r_{2} O_{7}, C u S O_{4}, H_{2} O_{2}, C l_{2}, O_{3}, F e C l_{3}, H N O_{3}$ oxidise aq. Iodide to iodine.
Alkaline $K M n O_{4}$ oxidise aq. Iodide to $I O_{3}^{-}$ .
No reaction between iodide and $N a_{2} S_{2} O_{3}$ .

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