Electrochemistry 1 Question 8
8. Given,
$E_{Cl_2/ Cl^-}^{\circ}$= $1.36 V, E_{{Cr}^{3+} / Cr}^{\circ}=-0.74 V$
$E_{Cr_2 O_7^{2-} / Cr^{3+}}^{\circ}$ $=1.33 V, E_{\text{MnO}_4^- / Mn^{2+}}^{\circ}$ $=1.51 V$
Among the following, the strongest reducing agent is
(2017 Main)
(a) $\mathrm{Cr}$
(b) $\mathrm{Mn}^{2+}$
(c) $\mathrm{Cr}^{3+}$
(d) $\mathrm{Cl}^{-}$
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Answer:
Correct Answer: 8. (a)
(a)
Solution:
- The substances which have lower reduction potentials are stronger reducing agents. Therefore, $\mathrm{Cr}\left(E_{\mathrm{Cr}^{3+} / \mathrm{Cr}}^{\circ}=-0.74 \mathrm{V}\right)$ is the strongest reducing agent among all the other given options.
