A) \[\text{Zn }\!\!|\!\!\text{ Z}{{\text{n}}^{2+}}\text{(1M) }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ C}{{\text{u}}^{2+}}(1M)|Cu\]
B) \[\text{Zn }\!\!|\!\!\text{ Z}{{\text{n}}^{2+}}\text{(1M) }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ A}{{\text{g}}^{+}}(1M)|Ag\]
C) \[\text{Cu }\!\!|\!\!\text{ C}{{\text{u}}^{2+}}\text{(1M) }\!\!|\!\!\text{ }\,\,\text{ }\!\!|\!\!\text{ A}{{\text{g}}^{+}}(1M)|Ag\]
D) \[Zn|Z{{n}^{2+}}(1M)|\,\,|C{{o}^{2+}}(1M)|Co\]
Correct Answer: B
Solution :
Standard reduction potentials of Ag = 0.799V Cu = 0.337V Co = - 0.277V Zn = -0.762V Maximum value of emf is possible when extreme +ve value of standard reduction potential connected with the extreme \[-\text{ve}\] value of standard reduction potential to form a cell. In the above data Ag has extreme \[\text{+}\,\text{ve}\] value and Zn has extreme \[-\text{ve}\] value. Hence, cell formed by silver and zinc electrode have maximum value of e. m. f.
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