Adissolved solute that only partially dissociates to form few ions is
a(
a. isotope ,
b. free radical
c. weak electrolyte
d. electrolyte

Weak electrolyte.
a weak electrolyte is an electrolyte that partially dissociates in solution. the solution will have both ions and molecules of the electrolyte.
electrolytes   are substances which, when dissolved in water, break up into cations (plus-charged ions) and anions (minus-charged ions). we say they ionize. strong  electrolytes  ionize completely (100%), while  weak electrolytes   ionize only partially (usually on the order of 1–10%