Which of the following molecule/molecules will not have zero dipole moment?
`CO_(2) , H_2O , BeF_2 , NH_3`

Explanation

To determine which of the given molecules has a non-zero dipole moment, we will analyze each molecule based on its shape and the electronegativity of the atoms involved.

### Step-by-Step Solution:

1. **Analyze CO₂ (Carbon Dioxide)**:
- **Shape**: Linear
- **Electronegativity**: Oxygen is more electronegative than carbon.
- **Dipole Moment**: The dipole moments from each oxygen (δ-) towards carbon (δ+) are equal in magnitude but opposite in direction. Therefore, they cancel each other out.
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