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Q.

Aqueous CuSO4 is subjected to electrolysis using copper electrodes by passing 0.2 F of electricity. Correct statement about the process is

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a

0.2 moles of oxygen is liberated at anode

b

2.24 litres of hydrogen (at STP) is liberated at cathode

c

0.2 moles of copper decomposes at anode

d

0.1 moles of copper is deposited at cathode

answer is D.

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Detailed Solution

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Attackable electrodes are used.

At cathode :

ECu+2/Cuo> EH+/12H2,Pto

    Cu+2+2eCu

At anode :

 ECu/Cu+2o> EH2O/O2o

 CuCu+2+2e

Thus 2 F can deposit or decompose 2 gram equivalents (1 mole) of copper.

0.2 F can deposit 0.2 gram equivalents (0.1 moles) of copper at cathode.

0.2 F can decompose 0.2 gram equivalents (0.1 moles) of copper at anode.

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