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An ammeter and copper voltmeter are conn...

An ammeter and copper voltmeter are connected in aseries in an electric circuit through which a constant direct current flows. The ammeter shows `0.525` ampere. If `0.6354 g` of `Cu` is deposited in `1` hr, what is the percentge error of ammeter ? `["At. wt. of "Cu = 63.54]`

Text Solution

Verified by Experts

The electrode reaction is :
`underset("1 mole")(Cu^(2+))+ underset(2xx96500 C)(2e^(-)) rarr Cu`
63.5 g of copper deposited by passing charge
`=2xx96500` coulomb
0.635 g of copper deposited by passing charge
`=(2xx96500)/(63.5)xx0.653` coulomb
`=2 xx 965` coulomb
`=1930` coulomb
We know that,
`Q=I xx t`
`1930=Ixx60xx60`
`I=1930/3600=0.536` ampere
`:.` Percentage error `=((0.536-0.52))/(0.536) xx100=2.985`
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