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A certain quantity of electricity is pas...

A certain quantity of electricity is passed through aq. `Al_(2)(SO_(4))_(3) and CuSO_(4)` solutions connected in series `0.09` g of Al is deposited on cathode during electrolysis . The amount of copper deposited on cathode in grams is (At., mass of Al = 27 , Cu = 63.6)

A

`3.18`

B

`0.318`

C

`31.8`

D

`0.636`

Text Solution

Verified by Experts

The correct Answer is:
B
A/c. to Faraday's second law
`(W_(Al))/(W_(Cu)) = (E_(Al))/(E_(Cu))`
`therefore W_(Cu) = (W_(Al) + E_(Cu))/(E_(Al)) = (0.09 xx 63.6 // 2)/(9) = 0.318 g`
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