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1 mark

In context of the lanthanoids, which of the following statements is not correct?

  1. A
    All the members exhibit oxidation state
  2. B
    Because of similar properties the separation of lanthanoids is not easy.
  3. C
    Availability of electrons results in the formation of compounds in state for all the members of the series.
  4. D
    There is a gradual decrease in the radii of the members with increasing atomic number in the series.

Solution & Step-by-step Explanation

While is the common oxidation state, is exhibited only by a few elements like Ce, Pr, Tb etc., where the configuration is stable (). It is not possible for all members.

Practice this question

Try it yourself before checking the explanation above.

In context of the lanthanoids, which of the following statements is not correct?
A
All the members exhibit oxidation state
B
Because of similar properties the separation of lanthanoids is not easy.
C
Availability of electrons results in the formation of compounds in state for all the members of the series.
D
There is a gradual decrease in the radii of the members with increasing atomic number in the series.

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