Question

Which of the following have the maximum Molecular motion?
A- Solid
B- Liquid
C- Gas
D- Liquid and gas

Answer 1

Hint:As we know that everything around us is made up of matter and there are three classical states of matter, solid, liquid and gases. We also know that thermal energy is the energy of the body due to motion or movement of its atoms or molecules, as temperature increases, it increases.

Complete answer:As we know that everything around us is made up of matter and there are three classical states of matter which are- solid, liquid and gases.
-Now let us talk about the phenomenon of thermal energy. Thermal energy is that energy of a body which is due to the motion or movements of its atoms or molecules. As the temperature increases, thermal energy increases, so the kinetic energy of the atoms or molecules also increases. As the movement of particles increases, the molecules move far apart from each other.

-Thus we can say that thermal energy is the measure of the average kinetic energy of the particle of matters and is responsible for their movement. The movement of molecules in a certain direction is called the molecular motion.

-Now we know that solids have very tightly packed particles which is why they are unable to move from their position but can only vibrate on their fixed position, liquids on the other hand have its particles a bit apart from each other and they can move from their position and lastly the gases which have very loosely packed particles which can move randomly due to their high kinetic energy.

-So when temperature is increased the particles move faster in gaseous state, thus we can say that due to loss packing of particles in gaseous state it has the maximum molecular motion, liquids come next and last is solids.

Therefore the correct answer is (C).

Note: Remember that temperature is the measurement of kinetic energy and the thermal energy increases the kinetic energy of molecules. So, gases molecules having weak intermolecular attraction move randomly and show highest molecular motion as compared to solids and liquids.