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QJEEAdv20Chca91: JEE Advanced 2020 Chemistry - Class 11 JEEAdv20Chca91 Solution: In the chemical reaction between stoichiometric quantities of…

In the chemical reaction between stoichiometric quantities of KMnO4 and KI in weakly basic solution, what is the number of moles of I2 released for 4 moles of KMnO4 consumed?

Step-by-Step Verified Solution

In alkaline medium : Iodide is oxidised to iodate

2MnO4−+H2O+I−⟶2MnO2+2OH−+IO3−

But in weakly basic solution :

KMnO4+7+KI−1⟶MnO2+4+I20

Eq. of KMnO4 = Eq. of I2

4×3=n×2⇒n=6

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