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Chemistry · Electrochemistry

JEE Main 2025 — 4 April, Morning Shift — Question 1

On charging the lead storage battery, the oxidation state of lead changes from x1x_{1} to y1y_{1} at the anode and from x2x_{2} to y2y_{2} at the cathode. The values of x1,y1,x2x_{1}, y_{1}, x_{2}, y2\mathrm{y}_{2} are respectively

  1. Option A:

    +4,+2,0,+2+4,+2,0,+2

  2. Option B:

    +2,0,+2,+4+2,0,+2,+4

    Correct
  3. Option C:

    0,+2,+4,+20,+2,+4,+2

  4. Option D:

    +2,0,0,+4+2,0,0,+4

Answer: B

Step-by-step solution

On charging, lead storage battery

PbSO4+2→Pb0\stackrel{+2}{\mathrm{PbSO}_{4}} \rightarrow \stackrel{0}{\mathrm{Pb}} at anode

PbSO4+2→PbO2+4\stackrel{+2}{\mathrm{PbSO}_{4}} \rightarrow \stackrel{+4}{\mathrm{PbO_2}} at cathode

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
4 April, Morning Shift
Subject
Chemistry
Chapter
Electrochemistry
Topic
Batteries and Corrosion
On charging the lead storage battery, the oxidation state of lead… | JEE Main 2025 PYQ with Solution · DhiX AI