JEE Main 2026 — Electrochemistry Question with Solution
JEE Main 2026 (22 January Shift 2)
Question
Consider the following reduction processes :
The tendency to act as reducing agent decreases in the order :
The tendency to act as reducing agent decreases in the order :
Choose an option
Show full solutionCorrect option: A
Correct answer
A
Step-by-step explanation
Reducing agent strength is determined by oxidation potential (opposite sign of reduction potential). Stronger reducing agents have more negative oxidation potentials (easier to oxidize).
Oxidation potentials:
Al(s) → Al³⁺ has E° = +1.66 V (strongest reducing agent);
Cr(s) → Cr³⁺ has E° = +0.74 V;
Fe²⁺ → Fe³⁺ has E° = -0.77 V;
Co²⁺ → Co³⁺ has E° = -1.81 V (weakest reducing agent).
Order of decreasing reducing agent tendency: Al > Cr > Fe²⁺ > Co²⁺.
Oxidation potentials:
Al(s) → Al³⁺ has E° = +1.66 V (strongest reducing agent);
Cr(s) → Cr³⁺ has E° = +0.74 V;
Fe²⁺ → Fe³⁺ has E° = -0.77 V;
Co²⁺ → Co³⁺ has E° = -1.81 V (weakest reducing agent).
Order of decreasing reducing agent tendency: Al > Cr > Fe²⁺ > Co²⁺.
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This is a previous-year question from JEE Main 2026, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.