Final answer:
The reactivity of an electrolyte does not depend solely on the number of molecular particles present; it is also influenced by the degree of dissociation and whether the substance is a strong or weak electrolyte.
Step-by-step explanation:
The statement that the reactivity or combining power of an electrolyte depends solely on the number of molecular particles present is false. While the number of particles present in a solution is indeed important when considering colligative properties, it is not the only factor that dictates an electrolyte's reactivity.
Factors such as solute-solvent interactions, the degree of dissociation, and whether the solute is a strong electrolyte, a weak electrolyte, or a nonelectrolyte all play a role. A strong electrolyte, such as NaCl, when dissolved, dissociates into more particles compared to a nonelectrolyte like glucose.
NaCl separates into Na+ ions and Cl- ions, effectively doubling the number of particles in the solution, whereas glucose does not dissociate and thus contributes fewer particles to the solution relative to moles of substance dissolved.