Question

\text{The number of non-polar molecules from the following is \\_\\_\\_\\_\\_\\_.} \\\ \text{HF, H}_2\text{O, SO}_2, \, \text{H}_2, \, \text{CO}_2, \, \text{CH}_4, \, \text{NH}_3, \, \text{HCl, CHCl}_3, \, \text{BF}_3

Answer 1

Non-polar molecules have a symmetrical arrangement of atoms that results in no net dipole moment. In the given list: - $CO_2$ is linear and symmetrical, so it is non-polar. - $H_2$ is diatomic and non-polar because it is composed of identical atoms. - $CH_4$ has a tetrahedral geometry with symmetrical bond distribution, making it non-polar. - $BF_3$ has a trigonal planar geometry, which is symmetrical and therefore non-polar.
Other molecules like HF, $H_2O$, $SO_2$, $NH_3$, HCl, and $CHCl_3$ are polar due to their asymmetrical shapes or differences in electronegativity. Therefore, there are four non-polar molecules in the list.
The Correct answer is: 4