How much time is required to deposit `1xx10^(-3)` cm thick layer of silver (density is 1.05 g `cm^(-3)` ) on a surface of area 100 `cm^2` by passing a current of 5 A through `AgNO_3` solution?

Options

A. 125 s
B. 115 s
C. 18.7 s
D. 27.25 s

Answer

C

Explanation

Mass of Ag in coated layer = V x d `=1xx10^(-3) xx100xx1.05`=0.105 g
`W=(IxxtxxEq.wt.)/96500`
`t=(Wxx96500)/(IxxEq.wt.)=(0.105xx96500)/(5xx108)`=18.7 s