The electrochemical equivalent of zinc (atomic mass `= 65.4`) is

Options

A. `3.4 xx 10^(-3)`
B. `3.4 xx 10^(-2)`
C. `3.4 xx 10^(-5)`
D. `3.4 xx 10^(-4)`

Answer

D

Explanation

The electrode reaction is
`Zn^(2+)+2e^(-) rarr Zn`
Thus, equivalent mass of `Zn = ("atomic mass")/(2)`
`= 65.4//2 = 32.7 u`
`Z = ("Gram equivalent man"(g eq^(-1)))/("Faraday constant"(eq^(-1)))`
`= (32.7 g eq^(-1))/(96500 C eq^(-1))`
`= 0.00034 g//C`
`= 3.4 xx 10^(-4) g//C`