Q1 / 160 · WBJEE 2012 · Chemistry

Li occupies higher position in the electrochemical series of metals as compared to Cu since

  • Correct answer
    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

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.

Hence, the correct answer is option: 'A'.

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