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Ce⁺⁴ in aqueous solution is not known

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

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

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

answer is C.

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Detailed Solution

The earlier members of lanthanoid series resemble calcium in some of their chemical properties. eg., Hydroxide of both of them are ionic and basic.

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