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How many of the following reagents can o...

How many of the following reagents can oxidise aqueous iodide to iodine.
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`

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The correct Answer is:
7
`K_2Cr_2O_7, KMnO_4,CuSO_4,H_2O_2,Cl_2,FeCl_3, HNO_3`
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