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QJEEAdv14Ch1069: JEE Advanced 2014 Chemistry - Class 11 JEEAdv14Ch1069 Solution: Consider the following list of reagents, acidified K 2 Cr 2 O 7 …

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

Step-by-Step Verified 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 + I2 → 2I− + Na2S4O6

Therefore, no reaction takes place between Na2S2O3 and iodide ion. Hence, correct integer is (7).

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