Although both `CO_(2)` and `H_(2)O` are triatomic molecules, the shape of `H_(2)O` molecules in bent while that of `CO_(2)` is linear. Explain this on the basis of dipole moment.

Explanation

`CO_(2)` has zero dipole moment. This means that `CO_(2)` molecule is linear so that the two `C=O` bond moments get cancelled giving zero resultant dipole moment. However, `H_(2)O` molecule has resultant dipole moment showing that it cannot be linear. The two `O-H` bonds are arranged in angular shape and the bond moment of two `O-H` bonds give resultant dipole moment.