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Which of the following has been universally accepted as a reference electrode at ail temperatures and has been assigned a value of zero volt?

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Which of the following has been universally accepted as a reference electrode at ail temperatures and has been assigned a value of zero volt?

(a) Platinum electrode

(b) Copper electrode

(c) Graphite electrode

(d) Standard hydrogen electrode

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Correct option (d) Standard hydrogen electrode

Explanation:

 Hydrogen electrode is the primary standard electrode. The hydrogen electrode can act as cathode or anode with respect to other electrode.

H2 → 2H+ + 2e- (Anode)

2H+ + 2e- → H2 (cathode)

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