You have two charges as shown in the image: A (which is positively charged) and B (which is negatively charged). If you insert a positive charge C in the middle of A and B, how would A and B move.
B
A
+
Оа
Oь
Ос
Od
A and B would move toward C.
A would move toward C, and B would move away from C.
A and B would move away from C.
A would move away from C and B would move toward C.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

the correct answer would be b) volume versus temperature, because they are also directly proportional.

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.