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STD 12 - 2. Electrochemistry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - 2. Electrochemistry4 Marks
MCQ
An electric current is passed through silver nitrate solution using silver electrodes. $10.79 \,g$  of silver was found to be deposited on the cathode if the same amount of electricity is passed through copper sulphate solution using copper electrodes, the weight of copper deposited on the cathode is ............. $\mathrm{g}$
  • A
    $6.4$
  • B
    $2.3$
  • C
    $12.8$
  • ✓
    $3.2 $
✓

Answer

Correct option: D.
$3.2 $
d
(e) Number of equivalents of silver formed $=$ Number of equivalents of copper formed.

In $AgN{O_3},\;Ag$ is in $+1$ oxidation state.

In $CuS{O_4},\;Cu$ is in $  +2 $ oxidation state.

Equivalent weight of $Ag  =\frac{{108}}{1} = 108$

Equivalent weight of $Cu  = \frac{{63.6}}{2} = 31.8$

$\frac{{{M_1}}}{{{M_2}}} = \frac{{{E_1}}}{{{E_2}}}$ ;     $\frac{{10.79}}{{{M_{Cu}}}} = \frac{{108}}{{31.8}}$

${M_{Cu}} = \frac{{10.79 \times 31.8}}{{108}} = 3.2\;gm$.

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