Question:
Which of the following statement is INCORRECT
Which of the following statement is INCORRECT
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Reactivity increases along the actinoid series initially. They are all radioactive and chemically reactive.
Updated On: Apr 24, 2026
- The actinoids show in general +3 oxidation state.
- Actinoids are less reactive metals.
- The magnetic properties of actinoids are more complex than those of lanthanoids.
- Hydrochloric acid attacks actinoids.
- Nitric acid slightly attacks actinoids.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Actinoids are the elements from Th (90) to Lr (103). Their properties vary due to the presence of 5f electrons.
Step 2: Detailed Explanation:
All given statements are correct except (B). Actinoids are highly reactive metals, especially when finely divided. They react with hot water, dilute acids, and non-metals. Their reactivity is generally higher than that of lanthanoids. They are not "less reactive"; they are quite reactive.
Step 3: Final Answer:
The incorrect statement is that actinoids are less reactive metals.
Actinoids are the elements from Th (90) to Lr (103). Their properties vary due to the presence of 5f electrons.
Step 2: Detailed Explanation:
All given statements are correct except (B). Actinoids are highly reactive metals, especially when finely divided. They react with hot water, dilute acids, and non-metals. Their reactivity is generally higher than that of lanthanoids. They are not "less reactive"; they are quite reactive.
Step 3: Final Answer:
The incorrect statement is that actinoids are less reactive metals.
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