Directions: In the following questions, a statement of assertion (A) ...
Be and Al show diagonal relationship because Be resembles in its properties with Al. Metallic radius of the Be (111 pm) is less than the metallic radius of Al (143 pm). Although smaller size is the reason for the anomalous behaviour of Be, it is not a reason for its diagonal relation with Al.
View all questions of this test
Directions: In the following questions, a statement of assertion (A) ...
Assertion (A): Be and Al show some similar properties.
Reason (R): The metallic radius of Be is less than the metallic radius of Al.
Explanation:
- The Assertion states that Be and Al show some similar properties.
- The Reason states that the metallic radius of Be is less than the metallic radius of Al.
- Let's analyze each statement separately to determine their validity and the relationship between them.
Assertion (A): Be and Al show some similar properties.
- Beryllium (Be) and Aluminum (Al) are both metallic elements and belong to the same group (Group 2) in the periodic table.
- Both Be and Al have relatively low densities, low melting points, and are good conductors of electricity.
- Therefore, the Assertion is true.
Reason (R): The metallic radius of Be is less than the metallic radius of Al.
- The metallic radius refers to the size of the metal atoms in a metallic lattice.
- Beryllium has a smaller atomic radius (1.11 Å) compared to Aluminum (1.43 Å).
- Since the metallic radius is directly related to the atomic radius, it can be inferred that the metallic radius of Be is indeed smaller than that of Al.
- Therefore, the Reason is true.
Relationship between Assertion and Reason:
- Both the Assertion and Reason are true.
- The Reason provides a correct explanation for the Assertion.
- The similar properties observed in Be and Al can be attributed, at least in part, to the smaller metallic radius of Be compared to Al.
- The smaller metallic radius can affect various properties such as density, melting point, and electrical conductivity.
Conclusion:
- Based on the analysis, the correct choice is option 'B': Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- While the Reason is true, it does not fully explain all the similar properties observed in Be and Al.
To make sure you are not studying endlessly, EduRev has designed Class 10 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 10.