Question

which of the two ferrous or ferric ion has larger magnetic moment and why?

Answer 1

Ferric ion has 5 unpaired electron but    ferrous has 4 so...ferric has more mag . moment

Answer 2

Ferric ion has higher magnetic moment because of higher number of unpaired electrons.

Explanation-

Formula used for magnetic moment :

$\mu=\sqrt{n(n+2)}$

where,

$\mu$ = magnetic moment

n = number of unpaired electronsThe metal is Fe and the electronic configuration of Fe is, $1s^22s^22p^63s^23p^63d^64s^2$

a)  The oxidation state of Fe is +2 in ferrous ion, thus the configuration is:

$Fe^{2+}:1s^22s^22p^63s^23p^63d^6$

The number of unpaired electrons in Fe = 4

$\mu=\sqrt{4(4+2)}=4.9BM$

b) The oxidation state of Fe is +3 in ferric ion, thus the configuration is:

$Fe^{2+}:1s^22s^22p^63s^23p^63d^5$

The number of unpaired electrons in Fe = 5

$\mu=\sqrt{5(5+2)}=5.9BM$

Thus ferric ion has higher magnetic moment because of higher number of unpaired electrons.

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