Question

A substance exists in the solid state because
(a) forces between its molecules are weak.
(b) molecules are tightly packed.
(c) molecules can move throughout the volume occupied by the substance.
(d) molecules can move freely in the entire space available to them.

Answer 1

(b) molecules are tightly packed.

In solids, molecules are tightly packed and attractive forces between the molecules keep them closely packed to each other.