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Question

Consider the following list of Reagents: Acidified K2Cr2O7, Alkaline KMnO4, CuSO4,H2O2,Cl2,O3,FeCl3,HNO3 and Na2S2O3. The total number of reagents that can oxidise aqueous iodide to iodine is:

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Solution

Acidified K2Cr2O7,CuSO4,H2O2,Cl2,O3,FeCl3,HNO3 oxidise aq. Iodide to iodine.
Alkaline KMnO4 oxidise aq. Iodide to IO3
No reaction between aq. Iodide and Na2S2O3.
Reactions :
K2Cr2O7+7H2SO4+6KI4KrSO4+Cr2(SO4)3+3I2+7H2O
2CuSO4+4KICu2I2+I2+2K2SO4
H2O2+2KI2KOH+I2
CP2+2KI2KCl+I2
O3+2KI+H2O2KOH+I2+O2
2FeCl3+2KI2FeCl2+I2+2KCl
2KMnO4+KI+H2OKIO3+2MnO2+2KOH
Na2S2O3 will not react with KI

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