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Question

How long (in hours) must a current of 5 ampere be maintained to electroplate 60 g of calcium from molten CaCl2?

A
27 hours
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B
8.3 hours
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C
11 hours
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D
16 hours
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Solution

The correct option is D 16 hours
The reduction reaction:-
Ca2++2eCa
(i) Mole ratio=molesofCaformedmolesofelectrons=12
(ii) Moles of Ca=weightmolarmass=6040=1.5
(iii) Moles of Ca formed =Q(C)96500Cmol1e×moleratio
1.5mol=Q(C)96500Cmol1e×12
Q(C)=1.5××96500×2=289500C

Coulombs = ampere X seconds
Seconds = 289X10^5 / 5 = 57900 seconds
57900 s X (1 hr / 3600 s) = 16 hours


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