Number of molecules among the following having non - zero dipole moment is :
`O_3,SO_3,SF_4,SF_6,H_2S,CS_2,SO_2,H_2O and H_2O_2`

Answer

To determine the number of molecules among the given list that have a non-zero dipole moment, we will analyze each molecule one by one based on their molecular geometry and the presence of polar bonds.

### Step-by-Step Solution:

1. **Ozone (O₃)**:
- O₃ has a bent structure due to the presence of a lone pair on the central oxygen atom.
- The dipole moments from the O=O bonds do not cancel out because of the bent shape.
- **Dipole Moment**: Non-zero.

2. **Sulfur Trioxide (SO₃)**:
- SO₃ has a trigonal planar structure. The dipole moments from the S=O bonds cancel each other out.
- **Dipole Moment**: Zero.

3. **Sulfur Tetrafluoride (SF₄)**:
- SF₄ has a seesaw shape due to one lone pair on sulfur. The dipole moments do not cancel out completely.
- **Dipole Moment**: Non-zero.

4. **Sulfur Hexafluoride (SF₆)**:
- SF₆ has an octahedral structure. The dipole moments from the S-F bonds cancel each other out.
- **Dipole Moment**: Zero.

5. **Hydrogen Sulfide (H₂S)**:
- H₂S has a bent shape due to the presence of lone pairs on sulfur. The dipole moments do not cancel out.
- **Dipole Moment**: Non-zero.

6. **Carbon Disulfide (CS₂)**:
- CS₂ has a linear structure. The dipole moments from the C=S bonds cancel each other out.
- **Dipole Moment**: Zero.

7. **Sulfur Dioxide (SO₂)**:
- SO₂ has a bent structure due to the presence of a lone pair on sulfur. The dipole moments do not cancel out.
- **Dipole Moment**: Non-zero.

8. **Water (H₂O)**:
- H₂O has a bent shape due to the two lone pairs on oxygen. The dipole moments do not cancel out.
- **Dipole Moment**: Non-zero.

9. **Hydrogen Peroxide (H₂O₂)**:
- H₂O₂ has a non-linear structure and the presence of lone pairs on the oxygen atoms leads to a net dipole moment.
- **Dipole Moment**: Non-zero.

### Summary of Results:
- Molecules with non-zero dipole moments: O₃, SF₄, H₂S, SO₂, H₂O, H₂O₂.
- Total count of molecules with non-zero dipole moments: **6**.

### Final Answer:
The number of molecules among the given list having a non-zero dipole moment is **6**.

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