Question

Which type of intermolecular force exists within $ {H_2}S $ molecules?

Answer 1

Hint: This question will be solved on the basis of VSEPR theory. Actually VSEPR theory will tell us about the shape of the molecule and the number of shared electrons and the number of lone pairs of electrons present around each atom.

Complete answer:
Intermolecular force is the force or the bonding present between the atoms of the molecules. These forces render the molecule to be stable and exist in nature.
Since, the Sulphur-dioxide molecule has two lone pairs of electrons around the central atom and the two electrons are shared with each hydrogen atom. So these two lone pairs of electrons on the central sulphur atom give the $ {H_2}S $ molecule its bent shape and make it a polar molecule with two polar bonds.
Since, we know that, sulphur is highly electronegative than hydrogen atom, which makes the $ H - S $ bond highly polar in nature. Thus we can say that $ H - S $ is a polar bond. This tells us that dipole- dipole interactions are present in the $ {H_2}S $ molecule.
Therefore our correct answer is: dipole- dipole interactions are present within the $ {H_2}S $ molecule. Hydrogen sulphide is a polar molecule.

Note:
Though, the total dipole moment of the $ {H_2}S $ molecule is $ 0 $ . This is because of the shape of the $ {H_2}S $ molecule i.e. the bent shape. Dipole- dipole interactions can be defined as the bonds in which the partial negative portion of one atom is attracted to the partial positive portion of the other atom. And this partial attraction makes the bond polar and thus gives rise to the dipole – dipole interactions.