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Question
The standard electrode potential of Zn and Ni are - 0.76 V and - 0.25 V respectively. If the reaction takes place in the cell constructed between these two electrodes is spontaneous. What is the standard emf of the cell?
Options
0.101 V
0.51 V
5.1 V
1.01 V
MCQ
Solution
0.51 V
Explanation:
`"E"_"Zn"^0` = - 0.76 V, `"E"_"Ni"^0` = - 0.25 V
`"E"_"cell"^0 = "E"_"cathode"^0 - "E"_"anode"^0`
= `"E"_"Ni"^0 - "E"_"Zn"^0`
= - 0.25 - (- 0.76)
= - 0.25 + 0.76
= 0.51 V
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Electrode Potential and Cell Potential
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