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JEE Main 20254 AprilMorning Shift
Exam
JEE Main
Year
2025
Date
4 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Electrochemistry

JEE Main 2025 · 4 April · Morning Shift · Chemistry · Electrochemistry

On charging the lead storage battery, the oxidation state of lead...

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,x2,y2x_1, y_1, x_2, y_2 are respectively :

Options

  1. A+4,+2,0,+2+4,+2,0,+2
  2. B+2,0,+2,+4+2,0,+2,+4
  3. C0,+2,+4,+20,+2,+4,+2
  4. D+2,0,0,+4+2,0,0,+4

Correct answer

B. +2,0,+2,+4+2,0,+2,+4

Step-by-step solution

For charging of lead storage battery cell reaction is 2PbSO4( s)+2H2O(l)→Pb(s)+PbO2( s)+2H2SO4(aq)2 \mathrm{PbSO}_4(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Pb}(\mathrm{s})+\mathrm{PbO}_2(\mathrm{~s})+2 \mathrm{H}_2 \mathrm{SO}_4(\mathrm{aq}) At anode PbSO4\mathrm{PbSO}_4 reduced back to Pb and at cathode PbSO4\mathrm{PbSO}_4 oxidised back to PbO2\mathrm{PbO}_2.
<br/>∵x1=+2,y1=0<br>x2=+2,y2=4<br/>\begin{aligned}<br />& \because \quad \mathrm{x}_1=+2, \mathrm{y}_1=0 \\<br>& \mathrm{x}_2=+2, \mathrm{y}_2=4<br />\end{aligned}
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