Answer :
Strong electrolyte solutes are, magnesium lactate, calcium lactate and potassium phosphate.
Weak electrolyte solute is, citric acid.
Explanation :
Strong electrolyte : It is defined as the species that can completely dissociates into ions in its aqueous solution.
Weak electrolyte : It is defined as the species that is partially dissociates into ions in its aqueous solution.
Non-electrolyte : It is defined as the species that does not dissociates into ions in its aqueous solution.
Now we have to determine the solute as a strong electrolyte, a weak electrolyte, or a non-electrolyte.
Citric acid : There is a partial dissociation into ions. So, it is a weak electrolyte.
Magnesium lactate, calcium lactate and potassium phosphate : There is a complete dissociation into ions. So, it is a strong electrolyte.