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Grade: 12th pass
        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?
9 months ago

Answers : (1)

Saurabh Kumar Sinha
15 Points
							
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 H(approx.)
 
one month ago
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