Question 3

SCQMEDIUM

One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is

(A)

I2I_2

(B)

IO3−IO_3^-

(C)

IO4−IO_4^-

(D)

IO2−IO_2^-

Detailed Solution

In neutral or faintly alkaline solutions, permanganate ion (MnO4−MnO_4^-) acts as an oxidizing agent and is reduced to manganese dioxide (MnO2MnO_2). It oxidizes iodide ion (I−I^-) to iodate ion (IO3−IO_3^-). The balanced chemical equation is: 2MnO4−+H2O+I−→2MnO2+2OH−+IO3−2MnO_4^- + H_2O + I^- \rightarrow 2MnO_2 + 2OH^- + IO_3^- In acidic medium, I−I^- would be oxidized to I2I_2, but in neutral medium, the product is IO3−IO_3^-.

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