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Q.

When molten lithium chloride (LiCl) is electrolyzed, lithium metal is formed at the cathode. If current efficiency is 75% then how many grams of lithium are liberated when 1930 C of charge pass through the cell ? (Atomic weight: Li = 7)

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a

0.120

b

0.28

c

0.105

d

0.240

answer is A.

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Detailed Solution

$\frac{W}{7} = \frac{1930 \times 0 .75}{96500}; W = 0 .105 gm$

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