Question

Question #11c25

Answer 1

Ammonia (`NH_3`)

Explanation:

Looking at molecular symmetry, you can see that the answer is `NH_3`.

`NO_2^+` is linear, `AlCl_3` is trigonal planar and `ICl_4` is square planar, so any bond polarities will balance out overall giving no net dipole moment.

That leaves just ozone `O_3` and ammonia. Ozone has a very small dipole moment as all 3 atoms are identical, and you just need to factor in the effect of the lone pair.

Ammonia on the other hand has 3 extremely polar bonds plus a lone pair. Dipole moment of around 3 D as opposed to ozone's value of about 0.5.