Question

The atomic numbers of elements A, B, D, E respectively are \(7, 17, 13, 11\). The element which forms basic oxide among them is

• A. E
• B. B
• C. D
• D. A

Hint:

Oxides of metals are generally basic, while oxides of nonmetals are acidic. Amphoteric oxides (e.g., \(Al_2O_3\)) show both acidic and basic behavior.

Answer 1

The Correct Option is A

Step 1: Identifying the Elements The atomic numbers of the given elements correspond to: 
- A (7): Nitrogen (N) 
- B (17): Chlorine (Cl) 
- D (13): Aluminum (Al) 
- E (11): Sodium (Na)

 Step 2: Determining the Nature of Their Oxides 
- Nitrogen (\(N\)) forms acidic oxides like \(NO_2, N_2O_5\). 
- Chlorine (\(Cl\)) forms acidic oxides like \(Cl_2O_7\). 
- Aluminum (\(Al\)) forms an amphoteric oxide \(Al_2O_3\). 
- Sodium (\(Na\)) forms a basic oxide \(Na_2O\), which dissolves in water to form \(NaOH\), a strong base.

 Step 3: Conclusion Since basic oxides are formed by metals, Sodium (Na) (element E) is the correct answer. Thus, the correct answer is \( \mathbf{(1)} \) E.