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Question: Answered & Verified by Expert
Li occupies higher position in the electrochemical series of metals as compared to Cu since
ChemistryElectrochemistryWBJEEWBJEE 2012
Options:
  • A the standard reduction potential of $\mathrm{Li}^{+} / \mathrm{Li}$ is lower than that of $\mathrm{Cu}^{2+} / \mathrm{Cu}$
  • B the standard reduction potential of $\mathrm{Cu}^{2+} / \mathrm{Cu}$ is lower than that of $\mathrm{Li}^{+} / \mathrm{Li}$
  • C the standard oxidation potential of $\operatorname{Li} / \mathrm{Li}^{+}$ is lower than that of $\mathrm{Cu} / \mathrm{Cu}^{2+}$
  • D $\mathrm{L} \mathrm{i}$ is smaller in size as compared to $\mathrm{Cu}$
Solution:
2627 Upvotes Verified Answer
The correct answer is: the standard reduction potential of $\mathrm{Li}^{+} / \mathrm{Li}$ is lower than that of $\mathrm{Cu}^{2+} / \mathrm{Cu}$
In the electrochemical series, metals are arranged in increasing order of their standard reduction potential. The standard reduction potentials of $L^{+} / L$ and $C u^{2+} / C u$ are -3.05 V and $+.034 \mathrm{V}$ respectively. Therefore, Li occupies higher position in series as compared to Cu.

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