A) \[Z{{n}^{2+}}+Cu\to Zn+C{{u}^{2+}}\]
B) \[C{{u}^{2+}}+Zn\to Cu+Z{{n}^{2+}}\]
C) \[Z{{n}^{2+}}+C{{u}^{2+}}\to Zn+Cu\]
D) None of these
Correct Answer: B
Solution :
[b] For spontaneous reaction \[E_{cell}^{0}\] must be positive. \[Z{{n}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Zn;\] \[{{E}^{0}}=-0.76\,\,V\] \[C{{u}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Cu;\] \[{{E}^{0}}=-0.34\,\,V\] Here Cu acts as cathode and zinc acts as anode. \[E_{cell}^{{}^\circ }=E_{C}^{{}^\circ }-E_{A}^{{}^\circ }=(-0.34)-(-0.76)\] \[=0.42\,\,V\]
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