A) entropy
B) heat content
C) heat of fusion
D) activation energy
Correct Answer: B
Solution :
Key Idea: Define all terms to find correct answer: (a) Entropy is the measurement of randomness of system. (b) Enthalpy or heat content: The difference in energy of product and energy of reactants is called heat content. (c) Heat of fusion is amount of heat absorbed or evolved when 1 mole of substance changes from solid state to liquid state at its melting point. (d) Activation energy is the extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold energy. Activation energy = Threshold energy - Average energy for reactants. \[\therefore \] Answer is (b).
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