MCQ
Most common oxidation states of $Ce$ are
- A$+ 2, + 3$
- B$+ 2, + 4$
- ✓$+ 3, + 4$
- D$ + 3, + 5$
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$A + O_2 \to B$ ;
$B + O_2 + H_2O \to C$
$A, B$ and $C$ are
