The cost of electricity required to deposit `1g Mg` is Rs. 5.00. the cost of `30g` of `Al` to be deposited is Rs. `X`. Find the value of `x/40`?
The cost of electricity required to deposit `1g Mg` is Rs. 5.00. the cost of `30g` of `Al` to be deposited is Rs. `X`. Find the value of `x/40`?
A. Rs `10.00`
B. Rs. `27.00`
C. Rs `44.44`
D. 66.67
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Correct Answer - D
`Mg^(2+) + 2e^(-) to Mg`
Quantity of electricity required to deposit 1 g
Mg = `(2 xx 96500)/(24)`
`Al^(3) + 3 e^(-) to Al`
Quantity of electricity required to deposit 10 g
`Al = (3 xx 96500)/(27) xx 10 C`
Its cost = `(5 xx 24)/(2 xx 96500) xx (3 xx 96500 xx 10)/(27) = `Rs. 66.67.
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