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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 cm3
Ag++eAg
2O2O2+4e
4Ag++2O2O2+4Ag ...(i)
Amount of silver generated = 0.108g
No. of mole of Ag=0.108108=0.001mole
No. of mole of O2 generated from equation (i) 0.0014
volume of O2=0.0014×22.4×103cm3
=5.6cm3

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