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Standard XII

Chemistry

Faraday's Second Law

Assume that i...

Question

Assume that impure copper contains only $F e, A u$ and $A g$ as impurities. After passage of $140$ ampere for $482.5$ sec, the mass of anode decreased by $22.260$ g and the cathode increased in mass by $22.011$ g. Calculate the percentage of iron and percentage of copper originally present.

F e

= 3%

C u

= 93%

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F e

= 2.5%

C u

= 89%

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F e

= 3.5%

C u

= 93%

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None of these

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Solution

The correct option is D None of these
Percentage of Iron present is given by

$% F e = \frac{22.260 - 22.011}{22.260} \times 100 = 1.12 %$

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Assume that impure copper contains only Fe,Au and Ag as impurities. After passage of 140 ampere for 482.5 sec, the mass of anode decreased by 22.260 g and the cathode increased in mass by 22.011 g. Calculate the percentage of iron and percentage of copper originally present.

The correct option is D None of thesePercentage of Iron present is given by%Fe=22.260−22.01122.260×100=1.12%

Assume that impure copper contains only $F e, A u$ and $A g$ as impurities. After passage of $140$ ampere for $482.5$ sec, the mass of anode decreased by $22.260$ g and the cathode increased in mass by $22.011$ g. Calculate the percentage of iron and percentage of copper originally present.

The correct option is D None of these
Percentage of Iron present is given by

$% F e = \frac{22.260 - 22.011}{22.260} \times 100 = 1.12 %$