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In an electrolysis experiment, a current i passes through two different cells in series, one containing a solution of $\mathrm{CuSO}_4$ and the other a solution of $\mathrm{AgNO}_3.$ The rate of increase of the weight of the cathodes in the two cells will be

• A
  In the ratio of the densities of $Cu$ and $Ag$
• B
  In the ratio of the at. weights of $Cu$ and $Ag$
• ✓
  In the ratio of half the atomic weight of $Cu$ to the atomic weight of $Ag$
• D
  In the ratio of half the atomic weight of $Cu$ to half the atomic weight of $Ag$