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Question

# An electric current is passed through silver voltameter connected to a water voltameter. The cathode of the silver voltameter weighed 0.108 g more at the end of the electrolysis. The volume of oxygen evolved at STP is :

A
56 cm3
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B
550 cm3
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C
5.6 cm3
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D
11.2 cm3
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E
22.4 cm3
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Solution

## The correct option is D 5.6 cm3Ag++e−→Ag2O2−→O2+4e−4Ag++2O2−→O2+4Ag ...(i)Amount of silver generated = 0.108gNo. of mole of Ag=0.108108=0.001moleNo. of mole of O2 generated from equation (i) 0.0014volume of O2=0.0014×22.4×103cm3 =5.6cm3

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