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An electric current is passed through silver voltameter connected to a water voltameter. The cathode of silver voltamter weighted 0.108 g more at the end of electrolysis. The volume of `O_2` at STP evolved is:

A

`5.6 cm^3`

B

`550 cm^3`

C

`22.4 cm^3`

D

`11.2 cm^3`

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