How long does it take to deposit 100 g of Al from an electrolytic cell containing `Al_(2)O_(3)` using a current of 125 ampere ?

Options

A. 1.54 h
B. 1.42 h
C. 1.32 h
D. 2.15 h

Answer

B

Explanation

`Al^(3+)+ 3e^(-) to Al` , Eq. wt. at `Al=27/3`=9
W = Z x I x t `rArr Z = "Eq. wt. "/96500`
`t=(Wxx96500)/("eq.wt. x I")=(50 xx 96500)/(9 xx 105)` = 5105.82 s or 1.42 h