Select correct answers from the choices A, B, C, D which are given. Write down only the letter corresponding to the correct answer.
Which of the following oxides reacts with an acid as well as a base? A ZnO, B CuO, C FeO, D CaO

Options

A. ZnO
B. CuO
C. FeO
D. CaO

Answer

To solve the question, we need to identify which of the given oxides can react with both an acid and a base. Let's analyze each option:

1. **Zinc Oxide (ZnO)**:
- Zinc oxide is known as an amphoteric oxide. This means it can react with both acids and bases.
- When it reacts with an acid (like hydrochloric acid, HCl), it forms zinc chloride (ZnCl2) and water.
- When it reacts with a base (like sodium hydroxide, NaOH), it forms sodium zincate (Na2ZnO2) and water.

2. **Copper Oxide (CuO)**:
- Copper oxide is a basic oxide. It does not react with bases but can react with acids to form copper salts and water.

3. **Iron Oxide (FeO)**:
- Iron oxide is also a basic oxide. Similar to copper oxide, it reacts with acids but not with bases.

4. **Calcium Oxide (CaO)**:
- Calcium oxide is a basic oxide. It primarily reacts with acids to form calcium salts and water, but it does not react with bases.

From this analysis, we can conclude that the only oxide that reacts with both an acid and a base is **Zinc Oxide (ZnO)**.

Thus, the correct answer is:
**A**