Answer:
(i) \[Cu+Z{{n}^{2+}}\to
C{{u}^{2+}}+Zn\]
\[E_{\operatorname{Re}dox\,process}^{{}^\circ
}=E_{\operatorname{Re}duced\,species}^{{}^\circ
}-E_{Oxidised\,species}^{{}^\circ }\]
\[=E_{Z{{n}^{2+}}/Zn}^{{}^\circ
}-E_{C{{u}^{2+}}/Cu}^{{}^\circ }\]
\[=(-0.76)-(+0.34)=-1.10V\]
Negative value shows that the
redox process is not feasible.
(ii) \[Mg+F{{e}^{2+}}\to
M{{g}^{2+}}+Fe\]
\[E_{\operatorname{Re}dox\,process}^{{}^\circ
}=E_{\operatorname{Re}duced\,species}^{{}^\circ
}-E_{Oxidised\,species}^{{}^\circ }\]
\[=E_{F{{e}^{2+}}/Fe}^{{}^\circ
}-E_{M{{g}^{2+}}/Mg}^{{}^\circ }\]
\[=-0.44-(-2.36)=+1.92V\]
Positive
value shows that the redox process is feasible.
(iii) \[B{{r}_{2}}+2C{{l}^{-}}\to
C{{l}_{2}}+2B{{r}^{-}}\]
\[E_{\operatorname{Re}dox\,process}^{{}^\circ
}=E_{\operatorname{Re}duced\,species}^{{}^\circ
}-E_{Oxidised\,species}^{{}^\circ }\]
\[=E_{B{{r}_{2}}/Br}^{{}^\circ
}-E_{C{{l}_{2}}/C{{l}^{-}}}^{{}^\circ }\]
\[=+1.09-1.36=-ve\]
Negative value shows that the redox
process is not feasible.
(iv) \[Fe+C{{d}^{2+}}\to
Cd+F{{e}^{2+}}\]
\[E_{\operatorname{Re}dox\,process}^{{}^\circ
}=E_{\operatorname{Re}duced\,species}^{{}^\circ
}-E_{Oxidised\,species}^{{}^\circ }\]
\[=E_{C{{d}^{2}}/Cd}^{{}^\circ
}-E_{F{{e}^{2+}}Fe}^{{}^\circ }\]
\[=(-0.40)-(-0.44)=+0.04V\]
Positive
value shows that the redox process is feasible.
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