During the electrolysis of molten sodium chloride, the time to produce 0.10 mol of chlorine gas using a current of 3 amperes is
A
55 minutes
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B
110 minutes
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C
220 minutes
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D
330 minutes
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Solution
The correct option is B 110 minutes During the electrolysis of molten sodium chloride,
At cathode: 2Na++2e−→2Na
At anode: 2Cl−→Cl2+2e−
(Net reaction:2Na++2Cl−→2Na+Cl2)−
According to Faraday’s first law of electrolysis, w=Z×I×t w=E96500×I×t
No of moles of Cl2 gas × Mol.wt.of Cl2 gas =Eq.wt.ofCl2gas×I×t96500 0.10×71=35.5×3×t96500 t=0.10×71×9650035.5×3=6433.33sec t=6433.3360min=107.22min≈110min