The charge required to deposit 40.5 g of Al (atomic mass 27 g ) from fused ` Al _ 2 ( SO _ 4 ) _ 3 ` is

Options

A. `4 34xx10^(5)C`
B. `43 4 xx10^(5)C`
C. `044xx10^(5)C`
D. None of these

Answer

A

Explanation

Gram equivalents of AI
` = (40.5)/(9 ) = 4.5 `
` because ` To deposit 1 g equivalent
1 Faraday or 96500 C electricity is required.
So, the charge required
` = 4.5 xx 96500 C = 4.34 xx 10 ^ 5 C `