Statement (I): In the Lanthanoids, the formation is favoured by its noble gas configuration.

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Solution

Q.
Given below are two statements:

Statement (I): In the Lanthanoids, the formation ${Ce}^{+ 4}$ is favoured by its noble gas configuration.

Statement (II): ${Ce}^{+ 4}$ is a strong oxidant reverting to the common +3 state.

In the light of the above statements, choose the most appropriate answer from the options given below: [2024]

1 Statement I is false but Statement II is true

2 Both Statement I and Statement II are true

3 Statement I is true but Statement II is false

4 Both Statement I and Statement II are false

Ans.
(2)

The common oxidation state of Lanthanoids is +3. Due to stable half-filled and fully-filled configurations other oxidation states of few elements such as ${Ce}^{4 +}$ $(4 f^{0}),$ ${Tb}^{4 +} (4 f^{7}),$ ${Eu}^{2 +}$ $(4 f^{7})$ and ${Yb}^{2 +}$ $(4 f^{14})$ also exist. However, these have tendency to revert to common oxidation state of +3. Hence, ${Ce}^{4 +}$ and ${Tb}^{4 +}$ are good oxidizing agents, ${Eu}^{2 +}$ and ${Yb}^{2 +}$ are good reducing agents.

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