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Q.

During the electrolysis of molten sodium chloride, the time required to produce 0.10 mol of chlorine gas using a current of 3 Amperes.

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a

220 minutes

b

55 minutes

c

330 minutes

d

110 minutes

answer is B.

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Detailed Solution

 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×tw=E96500×I×t

 No.of moles of Cl2 gas × Mol.wt.of Cl2 gas 

= Eq. wt. of Cl2gas×I×t965000.10×71=35.5×3×t96500t=0.10×71×9650035.5×3=6433.33sec

t=6433.3360 min=107.22 min110 min

 

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