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In the following questions a statement o...

In the following questions a statement of assertion (A) is followed by a statement of reason ( R)
A: Be and AI show diagonal relationship .
R: Be and AI are diagonal to each other in the periodic table .

A

If Both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1) .

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statements then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Assertion (A)**: The assertion states that Beryllium (Be) and Aluminium (Al) show a diagonal relationship. This means that these two elements exhibit similarities in their chemical and physical properties despite being in different groups of the periodic table. 2. **Identifying the Diagonal Relationship**: In the periodic table, Beryllium is located in Group 2 (alkaline earth metals), while Aluminium is in Group 13 (p-block elements). The diagonal relationship occurs between elements that are positioned diagonally to each other in the periodic table. In this case, Be and Al are indeed diagonally related. 3. **Explaining the Similar Properties**: The diagonal relationship is characterized by similarities in properties such as: - **Ionic Charge**: Beryllium typically forms a +2 ion (Be²⁺) and Aluminium forms a +3 ion (Al³⁺). Despite the different charges, the ionic sizes are comparable. - **Electronegativity**: Both elements have similar electronegativity values, around 1.5 to 1.6. - **Oxide Behavior**: The oxides of both elements (BeO and Al₂O₃) are amphoteric, meaning they can react with both acids and bases. 4. **Analyzing the Reason (R)**: The reason states that Be and Al are diagonally positioned in the periodic table. While this is true, it does not explain why they exhibit similar properties. The diagonal relationship arises from their comparable properties rather than their position in the periodic table. 5. **Conclusion**: The assertion (A) is true because Be and Al do show a diagonal relationship. However, the reason (R) is also true but does not adequately explain the assertion. Therefore, the correct conclusion is that the assertion is true, but the reason is not a valid explanation for the assertion. **Final Answer**: The assertion is true, and the reason is true but does not explain the assertion. ---
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