When hno2 is dissolved in water it partially dissociates according to the equation hno2⇌h++no−2. a solution is prepared that contains 7.050 g of hno2 in 1.000 kg of water. its freezing point is found to be -0.2929 ∘c?

Anyone know the answer?

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.