Which one is the correct equation that represents the first law of electrolysis?
A
mZ=ct
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B
m=cZt
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C
mc=Zt
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D
c=mZt
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Solution
The correct option is Cm=cZt
If 'm' is the weight or amount of a substance deposited or liberated and 'c' ampere of current is passed for ’t’ seconds, then according to the law:
m α c x t
Or m = Z c t
Where Z is a constant, known as "electrochemical equivalent" of the substance. If one ampere of current is passed for one second; then w = Z. This means when one ampere of current is passed for one second; then the weight or amount of the substance deposited or liberated is exactly equal to its electrochemical equivalent.