The most common oxidation states of cerium are __________.

+2 and +4

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+3 and +4

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+3 and +5

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+2 and +3

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Solution

The correct option is B +3 and +4
The electronic configuration of Ce is as follow:
$[X e] 4 f^{1} 5 d^{1} 6 s^{2}$
Thus, Cerium is most stable in +3 and +4 oxidation states.

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