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In the context of the lanthanoids, which of the statement is not correct?

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Availability of 4f electrons results in the formation of compounds in +4 state for all the members of the series

There is gradual decrease in the radii of the members with increasing atomic number in the series

All the members exhibit + 3 oxidation state.

Because of similar properties the separation of lanthanoids is not easy.

answer is A.

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Detailed Solution

The principal oxidation state shown by lanthanoids is +3.

The gradual decrease in atomic size with increasing atomic number is due to the poor shielding effect of 4f electrons. This results in the increase in the effective nuclear charge which causes the decrease in atomic radii.

The chemical properties of lanthanides are quite similar which make their separations a difficult task.

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