Which of the following statement is not true?

Question

Accepted Answer

Option 2 is the correct answer because it states that "The molecules in a liquid are arranged in a regular pattern." This statement is not true. In reality, the molecules in a liquid are not arranged in a regular pattern. Instead, they are randomly distributed and can move past one another, which allows liquids to flow and take the shape of their container. Unlike solids, which have a fixed, regular arrangement of molecules, liquids have a more disordered structure due to the weaker intermolecular forces that allow for greater movement.

Now, let's explain why each of the other options is incorrect:

1. **Option 1: The molecules of a gas occupy all the space available.**
   - This statement is true. Gas molecules are in constant, random motion and will spread out to fill the entire volume of the container they are in. This behavior is a fundamental characteristic of gases, as they have neither a fixed shape nor a fixed volume.

3. **Option 3: The molecules in a solid vibrate about a fixed position.**
   - This statement is true. In solids, molecules are tightly packed in a fixed, orderly arrangement. While they do not move freely, they do vibrate around their fixed positions. This vibration increases with temperature but does not result in the molecules moving past one another, which is why solids maintain a definite shape.

4. **Option 4: The molecules in a gas exert negligibly small forces on each other, except during collisions.**
   - This statement is true. In an ideal gas, the intermolecular forces are considered negligible except during collisions. This assumption is part of the kinetic molecular theory of gases, which explains that gas molecules are far apart and interact primarily through elastic collisions, with minimal attractive or repulsive forces between them.

In summary, Option 2 is the correct answer because it inaccurately describes the arrangement of molecules in a liquid, whereas the other options accurately describe the behavior of molecules in gases and solids.