Electrochemistry - Result Question 57

####6. The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of PbSO4 electrolysed in g during the process is (Molar mass of PbSO4=303gmol1 )

(2019 Main, 9 Jan I)

(a) 11.4

(b) 7.6

(c) 15.2

(d) 22.8

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Answer:

Correct Answer: 6. (a)

Solution:

Key Idea This question is based upon Faraday’s first law which states that “Mass of any substance deposited or liberated at any electrode is directly proportional to the quantity of electricity passed.”

During charging:

Pb+SO42PbSO4+2e =12mol of PbSO43032gPbSO4 0.05F3032×0.05g of PbSO4 =7.575g of PbSO4



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