Both () and () are reducing agents. However, in an aqueous solution, is a much stronger reducing age — d and f Block Elements Chemistry Question

💡 Solution & Explanation

$Cr^{2+} \to Cr^{3+}$ ($t_{2g}^3$ in water) provides massive crystal field stabilization energy. $Fe^{2+} \to Fe^{3+}$ ($d^5$ in water) is stable due to exchange energy, but the $t_{2g}^3$ state in aqueous media provides a larger overall thermodynamic drive.