\( \mathrm{E}^{\circ} \) values for the couples \( \mathrm{Cr}^{3+} / \mathrm{Cr}^{2+} \) and \(...
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0\( \mathrm{E}^{\circ} \) values for the couples \( \mathrm{Cr}^{3+} / \mathrm{Cr}^{2+} \) and \( \mathrm{Mn}^{3+} / \mathrm{Mn}^{2+} \) are -0.41 and +1.51 volts, respectively. Considering these values select the correct option from the following statements.
(a) \( \mathrm{Cr}^{2+} \) acts as a reducing agent and \( \mathrm{Mn}^{3+} \) acts as an oxidising agent in their aqueous solutions.
(b) \( \mathrm{Cr}^{2+} \) (aq.) is more stable than \( \mathrm{Cr}^{3+} \) (aq.).
(c) \( \mathrm{Mn}^{3+} \) (aq.) is more stable than \( \mathrm{Mn}^{2+} \) (aq.).
(d) None of these.
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