Question

Identify the correct statements from the following: I. Conjugate base of chloric acid is \( ClO^- \)
II. \( AlCl_3 \) is a Lewis acid
III. Conjugate base of \( NH_3 \) is \( NH_2^- \)

• A. I, II, III
• B. I, II only
• C. II, III only
• D. I, III only

Hint:

- A conjugate base is formed by removing \( H^+ \) from an acid.
- A Lewis acid is an electron pair acceptor (e.g., \( AlCl_3 \) with an incomplete octet).

Answer 1

The Correct Option is C

Step 1: Evaluating Each Statement 
- Statement I: Conjugate base of chloric acid 
- Chloric acid (\( HClO_3 \)) ionizes as: \[ HClO_3 \rightarrow ClO_3^- + H^+ \] 
- The conjugate base is \( ClO_3^- \), not \( ClO^- \). 
- Statement I is incorrect. 
- Statement II: \( AlCl_3 \) as a Lewis Acid 
- \( AlCl_3 \) has an incomplete octet (6 valence electrons on Al). 
- It accepts electron pairs, making it a Lewis acid. 
- Statement II is correct. 
- Statement III: Conjugate base of \( NH_3 \) 
- \( NH_3 \) is a weak base; its conjugate acid is \( NH_4^+ \). 
- The conjugate base of \( NH_3 \) is \( NH_2^- \). 
- Statement III is correct. 

Step 2: Conclusion Only Statements II and III are correct. Thus, the correct answer is \( \mathbf{(3)} \) II, III only.