Electrochemistry - Result Question 59
####8. Given, $E _{Cl _2 / Cl^{-}}^{\circ}=1.36 V, E _{Cr^{3+} / Cr}^{\circ}=-0.74 V$
$E _{Cr _2 O _7^{2-} / Cr^{3+}}^{\circ}=1.33 V, E _{MnO _4^{-} / Mn^{2+}}^{\circ}=1.51 V$
Among the following, the strongest reducing agent is
(2017 Main)
(a) $Cr$
(b) $Mn^{2+}$
(c) $Cr^{3+}$
(d) $Cl^{-}$
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Answer:
Correct Answer: 8. (b)
(a)
Solution:
- The substances which have lower reduction potentials are stronger reducing agents. Therefore, $Cr\left(E _{Cr^{3+} / Cr}^{\circ}=-0.74 V\right)$ is the strongest reducing agent among all the other given options.
