Potential energy U (for a pair of atoms) versus interatomic separation r for two substance A and B are as shown. For both substance, graphs of U v/s t are on same scale : Where E_(1) , E_(2) and E_(3) are total energy line (for a pair of atoms) and T_(1) , T_(2) and T_(3) are the corresponding temperatures. Also T_(1)gt T_(2) gt T_(3). {:("Column-I","Column-II"),("A) Expands of heating","P) Substance A"),("B) Contracts on heating","Q) Substance B"),("C) Liquifies above temperature" T_1 ,),("D) Liquifies above temperature" T_2,):}

Potential energy U (for a pair of atoms) versus interatomic separation

1.	Potential energy U (for a pair of atoms) versus interatomic separation r for two substance A and B are as shown. For both substance, graphs of U v/s t are on same scale : Where E_(1) , E_(2) and E_(3) are total energy line (for a pair of atoms) and T_(1) , T_(2) and T_(3) are the corresponding temperatures. Also T_(1)gt T_(2) gt T_(3). {:("Column-I","Column-II"),("A) Expands of heating","P) Substance A"),("B) Contracts on heating","Q) Substance B"),("C) Liquifies above temperature" T_1 ,),("D) Liquifies above temperature" T_2,):}
Answer» ANSWER :A-P; B-Q; C-P,Q; D-P