Most acidic oxide is

Options

A. `Na_(2)O`
B. `ZnO`
C. `MgO`
D. `P_(2)O_(5)`

Explanation

To determine the most acidic oxide, we need to analyze the nature of the given oxides and their reactions with water. Here’s a step-by-step solution:

### Step 1: Identify the Oxides
We need to evaluate the following oxides:
1. Sodium Oxide (Na2O)
2. Zinc Oxide (ZnO)
3. Magnesium Oxide (MgO)
4. Phosphorus Pentoxide (P2O5)

### Step 2: Analyze Sodium Oxide (Na2O)
- Sodium oxide is a metallic oxide.
- Metallic oxides are generally basic in nature.
- When Na2O reacts with water, it forms sodium hydroxide (NaOH), which dissociates into Na⁺ and OH⁻ ions.
- Since it produces OH⁻ ions, Na2O is classified as a basic oxide.

**Conclusion**: Na2O is not the most acidic oxide.

### Step 3: Analyze Zinc Oxide (ZnO)
- Zinc oxide is also a metallic oxide but is classified as amphoteric.
- Amphoteric oxides can react with both acids and bases.
- When ZnO reacts with an acid, it forms a salt and water. When it reacts with a base (like NaOH), it forms sodium zincate and water.
- Although ZnO can exhibit acidic behavior, it is not classified as the most acidic oxide.

**Conclusion**: ZnO is amphoteric, not the most acidic oxide.

### Step 4: Analyze Magnesium Oxide (MgO)
- Magnesium oxide is a metallic oxide.
- Similar to Na2O, MgO is basic in nature.
- When MgO reacts with water, it forms magnesium hydroxide (Mg(OH)2), which also produces OH⁻ ions.
- Therefore, MgO is classified as a basic oxide.

**Conclusion**: MgO is also not the most acidic oxide.

### Step 5: Analyze Phosphorus Pentoxide (P2O5)
- P2O5 is a non-metallic oxide.
- Non-metallic oxides are generally acidic in nature.
- When P2O5 reacts with water, it forms phosphoric acid (H3PO4), which has three H⁺ ions.
- This indicates that P2O5 is indeed an acidic oxide.

**Conclusion**: P2O5 is the most acidic oxide among the options given.

### Final Answer
The most acidic oxide is **P2O5**.

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