Question

question 24 of 25
which molecule has a dipole moment?
a. h₂s (bent geometry)
b. co₂ (linear geometry)
c. cl₂ (linear geometry)
d. ccl₄ (tetrahedral geometry)

Explanation:

Step1: Recall dipole - moment concept

A dipole - moment exists in a molecule when there is a separation of positive and negative charges due to electronegativity differences and non - symmetric molecular geometry.

Step2: Analyze option A

In $H_2S$ (bent geometry), sulfur is more electronegative than hydrogen. The bent shape means the bond dipoles do not cancel out, so it has a non - zero dipole moment.

Step3: Analyze option B

In $CO_2$ (linear geometry), although there are polar C=O bonds, the linear shape causes the bond dipoles to cancel each other out, resulting in a zero dipole moment.

Step4: Analyze option C

$Cl_2$ is a non - polar molecule as it consists of two identical atoms. There is no electronegativity difference, so it has no dipole moment.

Step5: Analyze option D

In $CCl_4$ (tetrahedral geometry), the polar C - Cl bonds are symmetrically arranged around the carbon atom. The bond dipoles cancel each other out, and the molecule has a zero dipole moment.

Answer:

A. $H_2S$ (bent geometry)