$\text{Mn}^{2+}$ compounds are more stable than $\text{Fe}^{2+}$ compounds toward oxidation to their +3 state because

Question

$\text{Mn}^{2+}$ is more stable with a high third ionisation energy.

$\text{Mn}^{2+}$ is larger in size.

$\text{Mn}^{2+}$ has completely filled d-orbitals.

$\text{Mn}^{2+}$ does not exist.

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