How much will the reduction potential of a hydrogen electro…

Chemistry Electrochemistry General Single Correct MCQ

Published on: August 14, 2026

How much will the reduction potential of a hydrogen electrode change when its solution initially at pH = 0 is neutralised to pH = 7 at 25ºC?

Increases by 0.059 V

Decreases by 0.059 V

Increases by 0.41 V

Decreases by 0.41 V

Text Solution

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The correct answer is:

H + + e – ⎯→ H 2 . E = 0 – log 10 = + 0.0591 log 10 [H + ].

E 1 = 0 {pH = 0}.

E 2 = + 0.0591log 10 [10 –7 ] = – .0591 × 7 {at pH = 7} = – 0.41 V.

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