The weight of silver (atomic weight =108) displaced by a quantity of electricity which displaces 5600 ml of O2 at STP will be:
A
5.4g
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B
10.8g
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C
54.0g
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D
108.0g
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Solution
The correct option is C108.0g At STP, 1 mole of oxygen occupies 22400 mL. Hence, the number of moles of oxygen corresponding to 5600 ml is nO2=560022400=14=WO2MO2. 1 mole of oxygen produces 4 moles of lectrons and 1 mole of silver requires 1 mole of electrons.
WAgMAg×1=WO2MO2×4
WAgMAg×1=14×4
WAg108=14×4
WAg=108g
Thus, the weight of silver displaced by a quantity of electricity which displaces 5600 ml of O2 at STP will be 108.0 g.