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Among the followingstatements identify c...

Among the followingstatements identify correct set of statements (a) size of Be is smaller than Mg (b) Ionisation energy of Be is greater than Al (c) Both Be and Al form covalent compounds readily (d) Both Be & Al does not react with nitrogen

A

a,b,c

B

a,c,d

C

b,c,d

D

a,b,d

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement regarding the elements Beryllium (Be) and Aluminium (Al) and determine which statements are correct. ### Step-by-Step Solution: 1. **Statement (a): Size of Be is smaller than Mg.** - Beryllium (Be) is in Period 2, and Magnesium (Mg) is in Period 3 of the periodic table. As we move down a group in the periodic table, the size of the elements increases due to the addition of electron shells. Therefore, the size of Be is indeed smaller than that of Mg. - **Conclusion:** This statement is **correct**. 2. **Statement (b): Ionisation energy of Be is greater than Al.** - The ionization energy is the energy required to remove an electron from an atom. Beryllium has a stable electronic configuration (1s² 2s²), making it more difficult to remove an electron compared to Aluminium (1s² 2s² 2p⁶ 3s² 3p¹), which has a less stable configuration. Thus, Beryllium has a higher ionization energy than Aluminium. - **Conclusion:** This statement is **correct**. 3. **Statement (c): Both Be and Al form covalent compounds readily.** - Beryllium tends to form covalent compounds due to its small size and high charge density. Aluminium can also form covalent compounds, particularly in certain conditions. The diagonal relationship between Be and Al suggests that both can form covalent compounds. - **Conclusion:** This statement is **correct**. 4. **Statement (d): Both Be & Al do not react with nitrogen.** - This statement is incorrect. Both Beryllium and Aluminium react with nitrogen to form their respective nitrides (Be₃N₂ and AlN). Therefore, this statement is false. - **Conclusion:** This statement is **incorrect**. ### Final Conclusion: The correct set of statements is (a), (b), and (c). Therefore, the answer is the first option: **ABC**. ---
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