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Question

A certain current liberated 0.504 g of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in CuSO4 solution?

A
12.7 g
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B
15.9 g
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C
31.8 g
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D
63.5 g
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Solution

The correct option is B 15.9 g
H++e0.5H2
moles of H2=0.5042=0.252moles
moles of electrons consumed=0.504moles
charge passed=0.504×96500=48636C
current(I)=486362×3600=6.755A
Cu2++2eCu
Same current passed for same time, hence charge passed is same.
Also, moles of e are same.
moles of Cu for 0.504 moles e=0.5042=0.252moles
weight of Cu=0.252×63.5=15.9g

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