MHT CET · Chemistry · Electrochemistry

Standard hydrogen electrode (SHE) is a

A Primary reference electrode
B Secondary reference electrode
C Metal – sparingly soluble salt electrode
D Metal – metal ion electrode

Verified Solution

Answer & Solution

Correct Answer

(A) Primary reference electrode

Step-by-step Solution

Detailed explanation

Standard hydrogen electrode (SHE) is primary reference electrode. SHE is represented by

P t (s) |H_{2} g| H^{+} (a q),

is assigned a zero potential at all temperatures corresponding to reaction.

H^{+} (a q) + e^{-} \to \frac{1}{2} H_{2} (g)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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