Discussion
Which of the following statement is INCORRECT?
Answer: B
The incorrect statement is Actinoids are less reactive metals.
The actinoid metals are highly reactive, especially when finely divided. They react with boiling water to give the oxide and hydride, and combine with most non-metals at moderate temperatures.
The other statements are correct. The general oxidation state of the actinoids is +3, though many show higher states too. Hydrochloric acid attacks all the actinoid metals, while nitric acid affects them only slightly because a protective oxide layer forms. Their magnetic properties are more complex than those of the lanthanoids, because the 5f electrons are less shielded and interact more strongly with their surroundings.
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