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The correct statement is...

The correct statement is

A

The earlier members of lanthanoid series resemble calcium in their chemical properties.

B

The extent of actinoid contraction is almost the same as lanthanoid contration.

C

In general, lathanoid and actinoids do not show variable oxidation states

D

`Ce^(+4)` in aqueous solution is not known

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The correct Answer is:
B
The extent of Lanthanoid Contration `(~~1.4 pm)` which is almost similar to actinoid contration (`~~`17pm)
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