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Variable Oxidation States

Which of the ...

Question

Which of the following is most stable among $C u^{+}, F e^{+}, F e^{2 +}, a n d F e^{3 +}$

C u^{+}

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F e^{+}

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F e^{2 +}

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F e^{3 +}

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Solution

The correct option is A $C u^{+}$
$F e^{3 +} : [A r] 3 d^{5}$
$C u^{+} : [A r] 3 d^{10}$
$F e^{2 +} : [A r] 3 d^{6}$
$F e^{+} : [A r] 3 d^{6} 4 s^{1}$
As Cu(I) have full filled configuration so it is most stable.

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Similar questions

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

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

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

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

E_{F e^{2 +} / F e}^{\circ} = - 0.44 V and E_{F e^{3 +} / F e^{2 +}}^{\circ} = 0.77 V

E_{F e^{3 +} / F e}^{\circ}

(E^{o})

F e^{3 +} \to F e

F e^{2 +} + 2 e 6 - \to F e; E_{F}^{o} e_{F e^{2 +} / F e} = - 0.47 V

F e^{3 +} + e^{-} \to F e^{2 +}; E_{F e^{3 +} / F e^{2 +}}^{o} = + 0.77 V

(E^{o})

F e^{3 +} \to F e

F e^{2 +} + 2 e^{-} \to F e; E_{F e^{2 +} / F e}^{o} = - 0.47 V

F e^{3 +} + e^{-} \to F e^{2 +}; E_{F e^{3} / F e^{2 +}}^{o} = + 0.77 V

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