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)**:
- Ozone has a bent shape due to the presence of a lone pair on the central oxygen atom. The dipole moments do not cancel out, resulting in a non-zero dipole moment.
- **Dipole Moment**: Non-zero.

2. **Sulfur Trioxide (SO₃)**:
- SO₃ has a trigonal planar geometry. The dipole moments of the S=O bonds cancel each other out, resulting in a zero dipole moment.
- **Dipole Moment**: Zero.

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

4. **Sulfur Hexafluoride (SF₆)**:
- SF₆ has an octahedral geometry. The dipole moments of the S-F bonds cancel each other out, resulting in a zero dipole moment.
- **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, resulting in a non-zero dipole moment.
- **Dipole Moment**: Non-zero.

6. **Carbon Disulfide (CS₂)**:
- CS₂ has a linear shape. The dipole moments of the C=S bonds cancel each other out, resulting in a zero dipole moment.
- **Dipole Moment**: Zero.

7. **Sulfur Dioxide (SO₂)**:
- SO₂ has a bent shape. The dipole moments do not cancel out, resulting in a non-zero dipole moment.
- **Dipole Moment**: Non-zero.

8. **Water (H₂O)**:
- H₂O has a bent shape due to the presence of lone pairs on oxygen. The dipole moments do not cancel out, resulting in a non-zero dipole moment.
- **Dipole Moment**: Non-zero.

9. **Hydrogen Peroxide (H₂O₂)**:
- H₂O₂ has a non-linear (book-shaped) structure. The dipole moments do not cancel out, resulting in a non-zero dipole moment.
- **Dipole Moment**: Non-zero.

### Summary of Dipole Moments:
- Non-zero dipole moments: O₃, SF₄, H₂S, SO₂, H₂O, H₂O₂
- Zero dipole moments: SO₃, SF₆, CS₂

### Final Count:
The total number of molecules with a non-zero dipole moment is **6**.