Question

Which of the following is an acidic oxide?

• A. CO
• B. NO
• C. $N_2O$
• D. $N_2O_5$

Hint:

The higher the oxidation state of the central non-metal atom, the more highly acidic the corresponding oxide will be. ($N_2O$ and $NO$ are neutral, but $N_2O_3$, $NO_2$, and $N_2O_5$ are progressively more acidic).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Oxides are classified based on their reaction with water/bases. Non-metal oxides in high oxidation states are typically acidic.

Step 2: Formula Application:
Analyze the oxidation states and properties: - CO, NO, and $N_2O$ are neutral oxides. - $N_2O_5$ is the anhydride of nitric acid ($HNO_3$).

Step 3: Explanation:
When $N_2O_5$ dissolves in water, it forms nitric acid: $N_2O_5 + H_2O \rightarrow 2HNO_3$. Because it produces an acid in water, it is classified as an acidic oxide. CO, NO, and $N_2O$ do not react with water to form acids or bases under normal conditions.

Step 4: Final Answer:
The acidic oxide is $N_2O_5$.