Question

Choose the incorrect statement:

• A. Actinoids are least reactive.
• B. Does not react with HCl.
• C. Does not react with HNO\(_3\).
• D.

Hint:

When studying the reactivity of the actinoids, keep in mind that while they are all highly reactive, the reactivity decreases as you move towards the heavier elements in the series.

Answer 1

The Correct Option is A

Actinoids (or actinides) are a series of elements that include thorium, uranium, and other elements. They are known for being highly reactive, especially the lighter actinides like thorium and uranium. - (a) Actinoids are least reactive is incorrect because actinoids, especially those with lower atomic numbers, are very reactive. For instance, uranium and thorium are highly reactive and can form compounds with many elements. - (b) Does not react with HCl: This is true for some actinides. For example, thorium reacts with hydrochloric acid to form thorium chloride (ThCl\(_4\)). - (c) Does not react with HNO\(_3\): This is also incorrect. Many actinides, including uranium, react with nitric acid (HNO\(_3\)) to form various uranium compounds. Therefore, the incorrect statement is that actinoids are least reactive.