Question

The oxide which can react with HCl as well as KOH to give corresponding salt and water is

• A. CuO
• B. Al₂O₃
• C. Na₂O
• D. K₂O

Answer 1

The Correct Option is B

Step 1: Understanding the reaction types:
An oxide that can react with both hydrochloric acid (HCl) and potassium hydroxide (KOH) must be amphoteric. Amphoteric oxides can react with both acids and bases to form salts and water.

Step 2: Analyzing the given options:
- Al₂O₃ (Aluminum oxide):
Aluminum oxide (Al₂O₃) is an amphoteric oxide. It reacts with acids like HCl to form salts (e.g., aluminum chloride) and with bases like KOH to form soluble aluminate salts.
Reaction with HCl:

  Al2O3 + 6HCl → 2AlCl3 + 3H2O
  

Reaction with KOH:

  Al2O3 + 2KOH + 3H2O → 2KAl(OH)4
  

Therefore, it reacts with both HCl and KOH to form the corresponding salt and water.

- Other oxides (e.g., basic oxides like Na₂O or acidic oxides like CO₂):
Basic oxides like sodium oxide (Na₂O) will only react with acids, while acidic oxides like CO₂ will only react with bases. They do not react with both acids and bases.

Step 3: Conclusion:
The oxide that can react with both HCl and KOH to give corresponding salt and water is Al₂O₃.