The following species are in increasing order of their acidic property: `ZnO, Na_(2)O, P_(2)O_(5), MgO`

Explanation

To determine the increasing order of acidic properties among the given oxides: ZnO, Na₂O, P₂O₅, and MgO, we will analyze each oxide based on its nature (metallic or non-metallic) and its position in the periodic table.

### Step-by-Step Solution:

1. **Identify the Nature of Each Oxide:**
- **ZnO (Zinc Oxide)**: Zinc is a transition metal. ZnO is amphoteric, meaning it can act as both an acid and a base, but it tends to show more acidic behavior compared to typical metallic oxides.
- **Na₂O (Sodium Oxide)**: Sodium is an alkali metal, and Na₂O is a strongly basic oxide.
- **P₂O₅ (Phosphorus Pentoxide)**: Phosphorus is a non-metal, and P₂O₅ is an acidic oxide.
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