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Lanthanoids in +4 oxidation state act as...

Lanthanoids in +4 oxidation state act as good oxidising agents.

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True because these can change to stable `M^(3+)`state
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Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name an element of lanthanoid series, which is known to show +4 oxidation state. Is it a strong oxidising agent or reducing agent?

Why Ce^(4+) is a good oxidising agent