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The most common oxidation states of ceri...

The most common oxidation states of cerium are

A

`+2` and `+3`

B

`+3` and `+4`

C

`+2` and `+4`

D

`+3` and `+5`

Text Solution

Verified by Experts

The correct Answer is:
B
The formation of `Ce(+4)` is favoured by its noble gas configuration, but it is a strong oxidant reverting to the common `+3` state. Thus, ceric sulphate, `Ce(SO_(4))_(2)` is most widely used as an oxidizing agent in the volumetric analysis. On heating in oxygen, lanthanides burn easily to give `M_(2)O_(3)` xcept for cerium which form `CO_(2)` as `Ce_(2)O_(3)` is oxidized by `O_(2)` .
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