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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 lanthanoids contraction.

C

in general, lanthanoids 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:
A
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