JEE Main 2026 — Electrochemistry Question with Solution
JEE Main 2026 (22 January Shift 1)
Question
Consider the following electrochemical cell at 298 K
.
If the reaction quotient at a given time is , then the cell EMF () is (Nearest integer).
Given the standard half-cell reduction potential as
.
If the reaction quotient at a given time is , then the cell EMF () is (Nearest integer).
Given the standard half-cell reduction potential as
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Show full solutionCorrect answer: 4
Correct answer
4
Step-by-step explanation
The electrochemical cell has cathode:
with V
and anode:
with V.
The standard cell EMF is V.
Using the Nernst equation with and electrons transferred:
V.
Expressing as V:
V, so (nearest integer).
with V
and anode:
with V.
The standard cell EMF is V.
Using the Nernst equation with and electrons transferred:
V.
Expressing as V:
V, so (nearest integer).
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