Ncert Exercises & Solutions

Given below are two statements:

Assertion (A):	Three states of matter are the result of a balance between intermolecular forces and the thermal energy of the molecules.
Reason (R):	Intermolecular forces tend to keep the molecules together but the thermal energy of molecules tends to keep them apart.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A).
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	(A) is false but (R) is true.

Hint: Thermal energy is the energy of a body arising from the motion of its atoms or molecules.

The intermolecular forces tend to keep the molecules together but the thermal energy of the molecules tends to keep them apart. Three states of matter are the result of balance between intermolecular forces and the thermal energy of the molecules

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