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In context of the lanthanoids, which of the following statements is not correct ? (1) All the members exhibit +3 oxidation state (2) Because of similar properties the separation of lanthanoids is not easy. (3) Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series. (4) There is a gradual decrease in the radii of the members with increasing atomic number in the series. ?????

In context of the lanthanoids, which of the following statements is not correct ?
(1) All the members exhibit +3 oxidation state
(2) Because of similar properties the separation of lanthanoids is not easy.
(3) Availability of 4f electrons results in the formation of compounds in +4 state for all the members
of the series.
(4) There is a gradual decrease in the radii of the members with increasing atomic number in the
series.
?????

Grade:11

1 Answers

Avinash
askIITians Faculty 1241 Points
8 years ago
(3) Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series.

Reason:
The common oxidation states of lanthanoids is +3. Some of the lanthonoids may also show +2 and +4 oxidation states however they easily revert to the more stable+3 state

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