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MnO(4)^(-) + 8H^(+) + 5e^(-) rightarrow ...

`MnO_(4)^(-) + 8H^(+) + 5e^(-) rightarrow Mn^(2+) + 4H-(2)O`,
If `H^(+)` concentration is decreased from 1 M to `10^(-4)` M at `25^(@)C`, whereas concentration of `Mn^(2+)` and `MnO_(4)^(-)` remains 1M, then:

A

The potential decreases by 0.38V with decrease in oxidising power.

B

The potential increases by 0.38 V with increase in oxidising power

C

the potential decreases by 0.25 V with decrease in oxidising power

D

the potential decreases by 0.38 V without affecting oxidising power.

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The correct Answer is:
A
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MnO_4^(-) + 8H^(=) + 5e^(-) rarr Mn^(2+) + 4 H_2 O If H^(+) concentration is decreaded from 1M to 10^(-4) M at 25^@ C .

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