Which among the following is stable?
$F e^{2 +}, F e^{3 +}$

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Solution

1. $F e^{3 +}$ is more stable.

2.The $d$ sub-shell has five orbitals, which can accomodate a total of 10 electrons. has half filled orbitals which provide extra stability to it because of symmetrical configuration.

3.Now $F e^{3 +}$ has $d^{5}$ configuration which suggests that it has a half filled d orbital which gives extra stability than $F e^{2 +}$ .

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Similar questions

Q. Which of the following is most stable among

C u^{+}, F e^{+}, F e^{2 +}, a n d F e^{3 +}

F e^{3 +}

compounds are more stable than

F e^{2 +}

compounds because:

Q. Which of the following statements are correct for the given electrochemical cells?
(I)

F e | F e^{2 +} | | F e^{3 +} | F e

(II)

F e | F e^{2 +} | | F e^{3 +}, F e^{2 +} | P t

(III)

F e | F e^{3 +} | | F e^{3 +}, F e^{2 +} | P t

Q. Assertion :

{C u}^{+}

is less stable than

{C u}^{2 +}

but

{F e}^{3 +}

is more stable than

{F e}^{2 +}

. Reason: Half filled and completely filled subshells are more stable.

While $F e^{3 +}$ is stable, $M n^{3 +}$ is not stabe in acid solution because:
$(M n^{3 +} + e^{-} \to M n^{2 +}, E^{\circ} = 1.5 V; O_{2} + 4 H^{+} + 4 e^{-} \to 2 H_{2} O, E^{\circ} = + 1.23 V; F e^{3 +} + e^{-} \to F e^{2 +}, E^{\circ} = 0.77 V)$

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Which among the following is stable?Fe2+,Fe3+

Which among the following is stable?
$F e^{2 +}, F e^{3 +}$