Consider the reaction below. nh4+ + h2o → nh3 + h3o+ which is an acid-conjugate base pair?

Answer : Option A)

Explanation : are considered as an acid-conjugate base pair, because is an acid with a proton extra in its compound which makes it more acidic and rich in proton, while is found to be the conjugate base of as it does not contains the ions.

both are acids, and the last option where both can be considered as bases.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

the answer would be c