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JEE Main 20253 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
3 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2025 · 3 April · Evening Shift · Chemistry · Electrochemistry

The standard cell potential (E_ cell ^ ) of a fuel cell based on...

The standard cell potential \left(\mathrm{E}_{\text{cell }^{\ominus}\right) of a fuel cell based on the oxidation of methanol in air that has been used to power television relay station is measured as 1.21 V. The standard half cell reduction potential for O2\mathrm{O}_2\left(\mathrm{E}_{\mathrm{O}_2 / \mathrm{H}_2 \mathrm{O}}^{\mathrm{O}}\right) is 1.229 V.Choose the correct statement:

Options

  1. AThe standard half cell reduction potential for the reduction of $\mathrm{CO}_2\left(\mathrm{E}_{\mathrm{CO}_2 / \mathrm{CH}_3 \mathrm{OH}}^0\right) is 19 mV
  2. BOxygen is formed at the anode.
  3. CReactants are fed at one go to each electrode.
  4. DReduction of methanol takes place at the cathode.

Correct answer

A. The standard half cell reduction potential for the reduction of $\mathrm{CO}_2\left(\mathrm{E}_{\mathrm{CO}_2 / \mathrm{CH}_3 \mathrm{OH}}^0\right) is 19 mV

Step-by-step solution

\begin{aligned}\because \mathrm{E}_{\text{cell }^{\mathrm{o}} & =\mathrm{E}_{\text{cathode }^{\mathrm{o}}-\mathrm{E}_{\text{Anode }^{\mathrm{o}} \\1.21 & =1.229-\mathrm{E}_{\text{Anode }^{\mathrm{o}}\end{aligned}\becauseFuelcellinvolvesoxidationofmethanolwhichwilloccuratanodeandreductionofFuel cell involves oxidation of methanol which will occur at anode and reduction of\mathrm{O}_2$ will occur at cathode.
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