`0.2864 g` of `Cu` was deposited on passage of a current of `0.5` ampere for `30` minutes through a copper sulphate solution. The electrochemical equivalent of copper is

Options

A. `0.32 g`
B. `0.00032 g`
C. `0.032 g`
D. `0.0032 g`

Answer

B

Explanation

In electrolysis, the mass of a substacne deposited or libereated when `1` ampere of current is passed through an electrolyte for `1` second (`1` coulomb of electricity) is known as its electrochemical equivalent `(Z)`. Therefore
`Z = ("Mass of Cu deposited")/("No. of Coulombs")`
`= (0.2864 g)/((0.5 A)(30 xx 60 s))`
`= 0.00032 g//C`