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The 2 most common oxidation states shown by cerium are

$(a)\;+2,+4\qquad(b)\;+3,+4\qquad(c)\;+3,+5\qquad(d)\;+2,+3$

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Most common oxidation states shown by cerium are +3,+4
Note: Cerium exhibits three oxidation states, +2, +3 and +4. The +2 state is rare and is observed in $CeH_2, CeI_2$ and $CeS$
answered Jan 29, 2014 by sreemathi.v
edited Aug 4, 2014 by balaji.thirumalai
 

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