Question

$Fe^{3+}$ compounds are more stable than $Fe^{2+}$ compounds because

• A. $Fe^{3+}$ has smaller size than $Fe^{2+}$
• B. $Fe^{3+}$ has $3d^5$ configuration (half-filled)
• C. $Fe^{3+}$ has higher oxidation state
• D. $Fe^{3+}$ is paramagnetic in nature

Answer 1

Answer: (B)

$Fe^{3+}$ has $3d^5$ configuration (half-filled)

Answer 2

$3d^5$ configuration is more stable due to singly occupied half-filled orbitals.