An electric current is passed through silver nitrated solution using silver electrodes . ` 10. 79 g` of silver qas found to be deposited on the cathode fi the same amount of electricity is passed through copper sulphate solutin using copper electrodes. the weihgt of copper deposited on teh cathode is .

Options

A. 6.4 g
B. 2.3 g
C. 12.8 g
D. 3.2 g

Answer

D

Explanation

Number of equivalents of silver formed=Number of equivalents of copper formed
In `AgNO_(#)`, Ag is in +1 oxidation state.
In `CuSO_(4)`, Cu is in +2 oxidation state.
Equivalet weight of `Ag=(108)/(1)=108`
Equivalent weight of `Cu=(63.6)/(2)=31.8`
`(M_(1))/(M_(2))=(E_(1))/(E_(2)),(10.79)/(M_(Cu))=(108)/(31.8)`
`M_(Cu)=(10.79xx31.8)/(108)=3.2gm`