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Q.

Which of the following is the charge present in 0.1 mole of Cu2+ ions if the electric charge on one electron is 1.602 × 10-19 C?


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a

0.2 F

b

0.4 F

c

0.8 F

d

10 F 

answer is A.

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Detailed Solution

In 0.1 mole of Cu2+ ions 0.2 F charge is present.
One Cu2+ ion consists of 2 positive charges.
One mole  of Cu2+ ion carries = 2 Farad charges.
So 0.1 mole Cu2+ ion includes = 0.2 F charge.
There are 6.02 ×1023 electrons per mole.
So we get the charge on one mole of electrons as-
1.6×10-16 × 6.02 ×1023 = 96500 C
which is also known as 1 Farad.
 
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