If the {\H}^{+}concentration is decreased from 1 {\M} to 10^{-4} {\M} at 25^\circ{\C} for the couple {\MnO}_{4}^{-} \/ {\Mn}^{2+}, then the oxidising power of the {\MnO}_{4}^{-} \/ {\Mn}^{2+} couple decreases by :

BITSAT 2006 Solved Question Paper

Section: Chemistry

Question : 115 of 150

Marks: +1, -0

If the H+concentration is decreased from 1M to 10−4M at 25°C for the couple MnO4−∕Mn2+, then the oxidising power of the MnO4−∕Mn2+ couple decreases by :

−0.18V
0.18V
0.38V
−0.38V

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