Q. 44

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.

Reason (R): Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

(i) Both A and R are true and R is the correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) A is false but R is true.

Answer :

(i)

We know that the thermal energy is the kind of energy which is generated due to the motion of atoms or molecules. The motion of molecules tries to keep the molecules away from each other, but the intermolecular forces of attraction is trying to keep the molecules or atoms together.


Hence, we can see the two forces are acting in opposite direction so, there is a need of balance between two forces.


As the different molecules have different strength of intermolecular forces and also different values of the thermal energy as well. Hence, the balance between two forces leads to existence of three states of matter.


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