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Question

Two electrolytic cells containing CuSO4 and AgNO4 respectively are connected in series and a current is passed through them unit 1 mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately
[ Atomic weight of copper and silver are respectively 63.57 and 107.88]
  1. 1.7mg
  2. 3.4mg
  3. 5.1mg
  4. 6.8mg

A
6.8mg
B
1.7mg
C
3.4mg
D
5.1mg
Solution
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The correct option is B 3.4mg
m1m2=E1E2 (By faraday law for same current and time)
Where E1 and E2 are the chemical equivalents and m1 and m2 are the masses of copper and silver respectively.
E=AtomicweightValencyE1=63.572=31.79 and
E2=107.881=107.88
1mgm2=31.79107.88m2=107.8831.79mg=3.4mg

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