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A copper voltameter, a silver voltameter...

A copper voltameter, a silver voltameter and a water voltameter are connected in series and a current is passed for some time. The ratio of the number of moles of copper, silver andhydrogen formed at the cathode is.

A

`2:1:1`

B

`1:1:1`

C

`1:2:1`

D

`1:2:2`

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