Imat 2014 question 45

Practice Question Solving
1

A battery has lead plates dipped in sulfuric acid. When charged, the positive plate is covered with
PbO2
After discharge both plates are covered with
PbSO4

Which option below correctly describes the overall change in the oxidation number of the lead involved in the chemical reaction during discharge?

A. Positive plate: 4 → 2; Negative plate: 2 → 0
B. Positive plate: 4 → 2; Negative plate: 0 → 2
C. Positive plate: 4 → 0; Negative plate: 0 → 2
D. Positive plate: 4 → 1; Negative plate: 0 → 1
E. Positive plate: 4 → 1; Negative plate: 1 → 0

2

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