Question

Choose the correct statement

• A. Polar molecules have permanent electric dipole moment
• B. ${CO}_2$ molecule is a polar molecule
• C. $H_{2}O$ is a non-polar molecule
• D. The dipole field at large distances falls of as $\frac{1}{r^2}$

Answer 1

The correct option is A Polar molecules have permanent electric dipole moment

The polar molecules do not have a permanent electric dipole moment and this dipole moment does not change because of the external factors.

The $C{O}_2$ is a non-polar molecule with no net dipole moment whereas $H_{2}O$ is a polar molecule.

The field due to a dipole varies as inversely proportional to the distance of the point from the axis of dipole.

$E\propto \frac{1}{r}$.

Therefore, statement $\left(A\right)$ is correct.