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Q.

The reduction of peroxydisulphate ion by I- ion is expressed by S2O82−+3 I−→2SO42−+I3−. If rate of disappearance of I- is 9/2×10−3 mol L−1 S−1, what is the rate of formation of SO42− during same time?

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a

10−3 mol L−1 s−1

b

2×10−3 mol L−1 s−1

c

3×10−3 mol L−1 s−1

d

4×10−3 mol L−1 s−1

answer is C.

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Detailed Solution

12d[SO42−]dt=13(−d[I−]dt)12×d[SO42−]dt=13×92×10−3∴ d[SO42−]dt=3×10−3 mol L−1 s−1.
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