Which of the following statements is incorrect? a.
A solution of sodium phosphate will have a pH of less than 7.
b.
A solution of potassium bromide will have a pH of 7.
c.
A solution of ammonium chloride will have a pH less than 7.
d.
A solution of cobalt(II) chloride will have a pH less than 7.
e.
Given that the Kb of ammonia is 1.8 x 10-5 and the Ka of hydrofluoric acid is 6.8 x 10-4, a solution of ammonium fluoride will have a pH of less than 7.

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.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.