Question

Observe the oxides \( CO, B_2O_3, SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3 \). The number of acidic oxides in the list is:

• A. 3
• B. 4
• C. 5
• D. 2

Hint:

Acidic oxides are typically non-metallic oxides, while amphoteric oxides can act as both acids and bases.

Answer 1

The Correct Option is A

To determine the number of acidic oxides in the given list, we need to classify each oxide as acidic, basic, or amphoteric based on their chemical behavior. Analysis of the Oxides:
1. \( CO \) (Carbon Monoxide):
- \( CO \) is a neutral oxide. It does not react with acids or bases to form salts. 2. \( B_2O_3 \) (Boron Oxide):
- \( B_2O_3 \) is an acidic oxide. It reacts with water to form boric acid (\( H_3BO_3 \)). 3. \( SiO_2 \) (Silicon Dioxide):
- \( SiO_2 \) is an acidic oxide. It reacts with bases to form silicates. 4. \( CO_2 \) (Carbon Dioxide):
- \( CO_2 \) is an acidic oxide. It reacts with water to form carbonic acid (\( H_2CO_3 \)). 5. \( Al_2O_3 \) (Aluminum Oxide):
- \( Al_2O_3 \) is an amphoteric oxide. It can react with both acids and bases. 6. \( PbO_2 \) (Lead Dioxide):
- \( PbO_2 \) is an amphoteric oxide. It can react with both acids and bases. 7. \( Tl_2O_3 \) (Thallium Oxide):
- \( Tl_2O_3 \) is a basic oxide. It reacts with acids to form salts. Summary:
Acidic oxides: \( B_2O_3, SiO_2, CO_2 \) (3 oxides).
Neutral oxide: \( CO \) (1 oxide).
Amphoteric oxides: \( Al_2O_3, PbO_2 \) (2 oxides).
Basic oxide: \( Tl_2O_3 \) (1 oxide).
Number of Acidic Oxides:
There are 3 acidic oxides in the list. The correct option is: \[ \boxed{\text{(1) 3}} \]