Question

$Fe^{3 +}$ion is more stable than $Fe^{2 +}$ion because

• A. More the charge on the atom, more is its stability
• B. Configuration of $Fe^{2 +}$is $3d^{6}$while $Fe^{3 +}$is $3d^{5}$
• C. $Fe^{2 +}$ has a larger size than $Fe^{3 +}$
• D. $Fe^{3 +}$ions are coloured hence more stable.

Answer 1

Answer: (B)

Configuration of $Fe^{2 +}$is $3d^{6}$while $Fe^{3 +}$is $3d^{5}$

Answer 2

$Fe^{2 +} - 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{6}$

$Fe^{3 +} - 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{5}$

In $Fe^{3 +},$ orbital in half filled hence provides extra stability.