The reduction of peroxydisulphate ion by I^{–} ion is expressed by S_2O_8^{2-} + 3I^{-} → 2SO_4^{2-} + I_3^{-} . If rate of disappearance of I^{-} is 9\/2\times10^{-3} mol \lit^{-1}s^{-1} , what is the rate of formation of 2SO_4^{2-} during same time?

Correct Answer is : 3 × 10−3 mol Lit−1s−1

3 × 10^{-3} mol \Lit^{-1} s^{-1}

4 × 10^{-3} mol \Lit^{-1} s^{-1}

BITSAT 2014 Paper

Section: Chemistry

Question : 61 of 150

Marks: +1, -0

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

3 × 10−3 mol Lit−1s−1
2 × 10−3 mol Lit−1s−1
10−3 mol Lit−1s−1
4 × 10−3 mol Lit−1s−1

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