Give the reactions for the following:
$(i)$ Reactions occurring at the electrodes and the overall redox reaction of a Daniell cell.
$(ii)$ Give the redox and electrode reactions of a $Cu-Ag$ galvanic cell.

$(i)$ For a Daniell cell $(Zn|Zn^{2+}||Cu^{2+}|Cu)$:
Anode reaction: $Zn(s) \rightarrow Zn^{2+}(aq) + 2e^-$
Cathode reaction: $Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)$
Overall redox reaction: $Zn(s) + Cu^{2+}(aq) \rightarrow Zn^{2+}(aq) + Cu(s)$
$(ii)$ For a $Cu-Ag$ galvanic cell $(Cu|Cu^{2+}||Ag^+|Ag)$:
Anode reaction: $Cu(s) \rightarrow Cu^{2+}(aq) + 2e^-$
Cathode reaction: $2Ag^+(aq) + 2e^- \rightarrow 2Ag(s)$
Overall redox reaction: $Cu(s) + 2Ag^+(aq) \rightarrow Cu^{2+}(aq) + 2Ag(s)$