You were asked to examine the protective ability of oxalic acid in preventing the oxidative degradation of vitamin C by catalytic ferric ions. At the beginning of the experiment, you or your partner prepared two solutions containing ascorbic acid. In one of these solutions, oxalic acid was added. Then to each of these solutions, ferric nitrate solution was added. The two solutions were then set aside in open containers. When you titrated a sample from each of these solutions, one containing oxalic acid and one without oxalic acid, which solution should have required more NBS to reach the endpoint?

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.  

the answer is d. matter from the air combined with the steel wool.