Order of increasing acidic property of ZnO, `Na_2O_2, P_2O_5`, MgO is

Options

A. `Na_2O_2 lt MgO lt ZnO lt P_2O_5`
B. `MgO_2 lt ZnO lt Na_2O_2 lt P_2O_5`
C. `ZnO lt Na_2O_2 lt MgO lt P_2O_5`
D. `Na_2O_2 lt ZnO lt MgO lt P_2O_5`

Explanation

To determine the order of increasing acidic property of ZnO, Na2O2, P2O5, and MgO, we will analyze the acidic properties of these oxides based on their positions in the periodic table and their chemical nature.

### Step-by-Step Solution:

1. **Identify the Oxides and Their Groups:**
- ZnO (Zinc oxide) - Zinc is a transition metal (D-block).
- Na2O2 (Sodium peroxide) - Sodium is an alkali metal (S-block).
- P2O5 (Phosphorus pentoxide) - Phosphorus is a non-metal (P-block).
- MgO (Magnesium oxide) - Magnesium is an alkaline earth metal (S-block).

2. **Understand the Acidic Properties:**
- Generally, as we move from left to right across a period, the acidic character of oxides increases.
- As we move down a group, the acidic character tends to decrease.

3. **Categorize the Oxides:**
- **Sodium peroxide (Na2O2)**: This is a basic oxide, but it can act as a weak acid in certain reactions.
- **Magnesium oxide (MgO)**: This is also a basic oxide, but it is less basic than sodium peroxide.
- **Zinc oxide (ZnO)**: This oxide has amphoteric properties, meaning it can act as both an acid and a base, but it is generally more acidic than MgO and Na2O2.
- **Phosphorus pentoxide (P2O5)**: This is a strongly acidic oxide.

4. **Rank the Oxides Based on Their Acidic Properties:**
- Based on the above analysis, we can rank the oxides in order of increasing acidic property:
- Na2O2 (least acidic)
- MgO
- ZnO
- P2O5 (most acidic)

5. **Final Order:**
- Therefore, the order of increasing acidic property is:
- Na2O2 < MgO < ZnO < P2O5

### Conclusion:
The order of increasing acidic property of ZnO, Na2O2, P2O5, and MgO is:
**Na2O2 < MgO < ZnO < P2O5**