Question

Which of the following is true for the molecules of gases?
(A) They have a fixed volume
(B) They have a fixed shape
(C) They cannot move freely
(D) They can move around freely

Answer 1

Hint : To answer this question, we first need to understand what gases are. A gas is a condition of stuff that does not have a definite shape or volume. Other states of matter, such as solids and liquids, have a lower density than gases. When a container is filled with additional gas particles, there is less area for them to spread out, and they become compressed.

Complete Step By Step Answer:
Molecules - A molecule is the smallest particle in a chemical element or compound that has that element's or compound's chemical properties. Molecules are composed of atoms bonded together by chemical bonds. The sharing or exchange of electrons between atoms forms these bonds.
Molecules of gases - Gases are made up of particles (molecules or atoms) that are constantly moving at random. Gas particles collide with one other and the container's walls on a regular basis. The overall volume occupied by gas molecules is insignificant in comparison to the whole volume of their container since gas particles are small.
So, we conclude that molecules of gases have –
-No fixed volume
-No fixed shape
-Can move freely
So, the final answer is option (D) i.e. They can move around freely.

Note :
Particles in a gas move in a straight path all the time. Because the molecule's kinetic energy exceeds the attraction between them, they are much farther apart and can freely move around. There are almost no attraction forces between particles in most circumstances.