Four of the following are strong electrolytes.
a. NH3 (weak electrolyte) b. NH4Cl (strong electrolyte)
c. CH3COOH (weak electrolyte) d. CH3COONa (strong electrolyte)
e. HCl (strong electrolyte) f. NaCl (strong electrolyte)
Salts are strong electrolytes. They undergo complete dissociation.
Weak acid (acetic acid) and weak base (ammonia) are weak electrolytes. They undergo partial dissociation.