question_answer 1)

  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. (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. 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.

Answer:

  (a) states of matter of a substance depends on the intermolecular force \[\xrightarrow[decreasing\text{ }intermolecular\text{ }force]{solid\text{ }>\text{ }liquid\text{ }>\text{ }gas}\] Intermolecular forces keep the molecules together while thermal energy of molecules tends to keep them apart.