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Question

Assuming no change in volume, the time required to obtain solution of pH=12 by electrolysis of 50ml. 0. 1M NaCl (using current of 0.5 amp) will be

A
65 sec
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B
96.5 sec
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C
965 sec
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D
9.65 sec
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Solution

The correct option is B 96.5 sec

[H+]=1012 M
[OH]=102M
Number of moles of NaOH is 50 mL solution =MV1000=102×501000
=5×104
Mass of NaOH in the solution =5×104×40=2×102 g
W=ItE96500
2×102=0.5×t×4096500
t=96.5 sec


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