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Q.

Electrolysis of aqueous ZnSO4 is carried out using inert electrodes. 4825 amperes of current is passed through the solution for 20 seconds. Weight of substance obtained at cathode is (Aw of Zn = 65.4)

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a

65.4 grams

b

1 gram

c

32.7 grams 

d

0.5 grams

answer is B.

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Detailed Solution

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Discharge potential of H+<Zn2+
Q=4825×20=96500C=1F
1F liberates one GEW (1 gram) of 
hydrogen at cathode.

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