Multiple choice Which of the following is a weak electrolyte? HBr H2CO3 HNO3 Reveal answer Fill a bubble to check yourself B Correct answer Explanation HBr and HNO3 are strong acids that dissociate completely in water, making them strong electrolytes. H2CO3 (carbonic acid) is a weak acid that only partially dissociates, classifying it as a weak electrolyte.