Chemistry Electrochemistry DUHS 2023
PMDC Verified Question 21 of 73
In electrochemical series, what is the electrode potential of all metals above Hydrogen?
A
Zero
B
Negative
C
Positive
D
Greater than zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Negative
Concept:

The standard electrochemical series is anchored around the Standard Hydrogen Electrode (SHE).

Solution:

  • The SHE is assigned a standard reduction potential of exactly \( 0.00 \text{ V} \).


  • Metals placed "above" hydrogen in the series (like Lithium, Zinc, Iron) are stronger reducing agents than Hydrogen gas.


  • Because they have a greater tendency to undergo oxidation rather than reduction compared to Hydrogen, their standard reduction potentials are negative (less than zero).


Why other options are incorrect:

Only Hydrogen has a potential of exactly zero. Metals below Hydrogen (like Copper, Silver, Gold) have positive (greater than zero) reduction potentials.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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