Answer :
The equation where the term heat represents the heat of fusion is NaCl(s) + heat -->NaCl(l).
The heat of fusion is the heat required to break the intermolecular interactions in a solid as it is converted to the liquid. Hence, the process of fusion is the process of converting a solid into a liquid.
Examining the equations shown in the options closely, we will discover that in the equation; NaCl(s) + heat -->NaCl(l), heat is supplied to sodium chloride solid and it is converted to liquid. The heat involved in this process is the heat of fusion.
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