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Faraday's Second Law

During electr...

Question

During electrolysis of an aqueous solution of $C u S O_{4}$ using copper electrodes, if 2.5 g of Cu is deposited at cathode, then at anode:

A

890 ml of

C l_{2}

at STP is liberated

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B

445 ml of

O_{2}

at STP is liberated

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C

2.5 g of copper is deposited

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D

a decrease of 2.5 g of mass takes place

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Solution

The correct option is D a decrease of 2.5 g of mass takes place
According to faraday's law:
$W = Z Q = (E / 96500) * Q$ .
Here, we are flowing same charge through cathode and anode, so at cathode and anode same mass reacts.
At cathode if 2.5 gm is reducing then at anode 2.5gm of Cu will be oxidized into solution so there is a decrease of 2.5 g of mass takes place.

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