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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 and HNO3 oxidise aq. iodide to iodine. Alkaline KMnO4 oxidise aq. iodide to IO3.
Na2S2O3 is a strong reducing agent which on reaction with I2 produces I.
Na2S2O3+I22I+Na2S4O6
Therefore, no reaction takes place between Na2S2O3 and iodide ion.
Hence, correct integer is (7).

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