Which statement is true according to the kinetic theory? a. only gases show random motion of particles. b. only gases and liquids show random motion of particles. c. solids have a fixed shape, so they do not show random motion of particles. d. all states of matter show random motion of particles.

Option (A) is the correct answer.

Explanation:

According to molecular kinetic theory, molecules of a gas collide in a randomly with each other and energy is neither gained or lost during these collisions.

As a result, molecules of a gas occupy almost negligible space of a container in which they are placed. Pressure is caused by the collisions and walls of the container on the gas molecules.

Therefore, we can conclude that the statement only gases show random motion of particles, is true according to the kinetic theory.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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.