Out of the following how many oxides are acidic.
`MnO,Mn_2O_3,MnO_2,MnO_3,Mn_2O_7`

Explanation

To determine how many of the given manganese oxides are acidic, we will analyze each oxide one by one based on their properties.

1. **MnO (Manganese(II) oxide)**:
- MnO is a basic oxide. It reacts with acids to form salts and water. Therefore, it is not acidic.

2. **Mn₂O₃ (Manganese(III) oxide)**:
- Mn₂O₃ can react with acids to form manganese salts and water. It has some acidic character but is primarily considered a basic oxide. Thus, it is not acidic.

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