Answer:
(i)
Anode \[Ag\to A{{g}^{+}}+{{e}^{-}}\]
Cathode \[A{{g}^{+}}+{{e}^{-}}\to
Ag\]
(ii) Cathode \[A{{g}^{+}}+{{e}^{-}}\to
Ag\]
Anode \[2O{{H}^{-}}\to
{{H}_{2}}O+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\]
(iii) In dilute\[{{H}_{2}}S{{O}_{4}}\], electrolysis of
water takes place.
\[{{H}_{2}}O\rightleftharpoons {{H}^{+}}+O{{H}^{-}}\]
Cathode \[2{{H}^{+}}+2{{e}^{-}}\to
{{H}_{2}}\uparrow \]
Anode \[2O{{H}^{+}}\to
{{H}_{2}}O+\frac{1}{2}{{O}_{2}}+2{{e}^{-}}\]
(iv) \[CuC{{l}_{2}}\to C{{u}^{2+}}+2{{e}^{-}}\to Cu\]
Cathode \[C{{u}^{2+}}+2{{e}^{-}}\to
Cu\]
Anode \[2C{{l}^{-}}\to
C{{l}^{2}}+2{{e}^{-}}\]
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