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 ±at their energy becomes equal to threshold energy, Activation energy = Threshold energy - Average energy for reactants. \[\therefore \] Answer is [b].
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