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An electric current is passed through a copper voltmeter and a water voltmeter connected in series. If the copper of the copper voltmeter now weights 16 mg less, hydrogen liberated at the cathode of water voltmeter measures at STP?

An electric current is passed through a copper voltmeter and a water voltmeter connected in series. If the copper of the copper voltmeter now weights 16 mg less, hydrogen liberated at the cathode of water voltmeter measures at STP?

Grade:12th pass

1 Answers

Saurabh Kumar Sinha
15 Points
5 years ago
Cu ---->  Cu2+   +  2e-
63.5g Cu is given by 2F
So,16g Cu gives 2/63.5 * 16 F
 
Now, 2H+ -----> H2  +  2e-
2F liberated 22.4L H2
So 2/63.5 * 16F liberated 22.4/2 * 32/63.5 = 5.6L H2 (approx.)
 

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