JEE Main 2023 · Chemistry · Electrochemistry · easy

The same quantity of electricity is passed through two electrolytic cells in series, one containing AgNO3 solution and the other CuSO4 solution…

Numerical answer

The same quantity of electricity is passed through two electrolytic cells in series, one containing

\mathrm{AgNO_3}

solution and the other

\mathrm{CuSO_4}

solution, using inert electrodes. If

2.16\ \mathrm g

of Ag is deposited, the mass of Cu deposited, in milligrams, is (atomic masses: Ag

=108

, Cu

=63.5

)

Show answer and solution

Answer: 635

Moles of Ag

=2.16/108=0.020

, so charge corresponds to

0.020

mol

e^-

(as

\mathrm{Ag^++e^-\to Ag}

). For copper,

\mathrm{Cu^{2+}+2e^-\to Cu}

, moles of Cu

=0.020/2=0.010

. Mass

=0.010\times63.5=0.635\ \mathrm g=635\ \mathrm{mg}

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