Question

Which of the following is true for electrochemical Daniel cell?

• A. Electrons flow from copper electrode to zine electrode
• B. Current flows from zinc electrode to copper electrode
• C. Cations move towards copper electrode
• D. Cations move towards copper electrode

Answer 1

The correct option is C Cations move towards copper electrode

The half reactions of whole redox reactions are
$Zn\to Z{n}^{2+}+2e^{-}C{u}^{2+}+2e^{-}\to Cu$
As zinc is oxidizing, it melts to $Z{n}^{2+}$ ions leaving the electrons is the rod which transfer to Cu rod which are used in reducing the Cu ions as $C{u}^{2+}+2e^{-}\to Cu$
So the electrons transfer from Zn rod to Cu rod.
So the current flow exactly opposite to the electron flow i.e., from Cu to Zn rod.
As $C{u}^{2+}$ ions getting reduced by accepting electrons.
To this to happen $C{u}^{2+}$ ions should move towards Cu rod and accept electrons.
So cations moves towards Cu electrode.