Question

Which of the following has a zero dipole moment?

• A. $C{O}_2$
• B. $N{H}_3$
• C. $N{F}_3$
• D. $H_{2}O$

Answer 1

The correct option is A $C{O}_2$

$C{O}_2$ is having a linear structure in such a way that the the individual $C=O$dipole moments cancel each other and the resultant dipole moment is zero.
$O=C=O$
$N{H}_3$ has a net upward dipole moment while $N{F}_3$ has a net dipole moment directed downwards.

For $H_{2}O$, there is a net dipole moment directed towards oxygen.