Question

Which of the following is/are true on the basis of kinetic theory of matter?

• A. Solids have a definite volume and definite shape
• B. Liquids have a definite volume, but no definite shape
• C. Gases have no definite volume and no definite shape
• D. All of the above

Answer 1

The correct option is D All of the above

(a) Solids have a definite volume and definite shape.
The particles that make up a solid are packed very closely together. In addition, each particle is tightly fixed in one position. This fixed, closely packed arrangement of particles causes a solid to have a definite shape and volume.
(b) Liquids have a definite volume, but no definite shape.
Liquid molecules are also packed closely together, but there is enough space between the molecules to allow them to slide past each other. This sliding action prevents the liquid from taking a shape of its own. As a result, liquids take the shape of the container that holds them.
(c) Gases have a no definite volume and no definite shape.
Gas molecules have either very weak bonds or no bonds at all, so they can move freely and quickly. Because of this, not only will a gas conform to the shape of its container, it will also expand to completely fill the container. Gas molecules have enough kinetic energy such that the effect of intermolecular forces is small (or zero, for an ideal gas), and they are spaced very far apart from each other; the typical distance between neighbouring molecules is much greater than the size of the molecules themselves.