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  • Try this! If 3 faraday of electricity is passed through the solution of AgNO3, CuSO4and AuCl3, the molar ratio of the cations deposited at the cathode is ?

If 3 faraday of electricity is passed through the solution of AgNO3, CuSO4 and AuCl3, the molar ratio of the cations deposited at the cathode is ?

  • Option 1)

    6 : 3 : 2

  • Option 2)

    3 : 2 : 6

  • Option 3)

    6 : 3 : 1

  • Option 4)

    6 : 3 : 4

 

Answers (1)

best_answer

As we have learnt,

 

Equivalent mass -

It is equal to the molecular or atomic mass divided by the number of electrons involved in the reaction per molecule, atom or ion.

- wherein

e.g. 2H_{2}O\:+\:2e^{-}\rightarrow H_{2}\:+\:2OH^{-}

2 Faraday of electricity is used to produce one mole of gas 

\therefore    Eq. Mass of hydrogen=\frac{2.016}{2}=1.008

 

 \\*Ag^+ + e^- \rightarrow Ag \\*Cu^{2+} + 2e^- \rightarrow Cu \\*Au^{3+} + 3e^- \rightarrow Au

Therefore 3 faraday electricity will deposite 3 moles of Ag, \frac{3}{2} moles of Cu and 1 of Au

 


Option 1)

6 : 3 : 2

Option 2)

3 : 2 : 6

Option 3)

6 : 3 : 1

Option 4)

6 : 3 : 4

Posted by

Aadil

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