Which chemical equation below is balanced correctly?

al4c3 + > 3ch4 + 4al(oh)3
nacl + cao > na2o + cacl2
3lioh + fe(no3)3 > 2lino3 + fe(oh)3
zn + 2hcl > zncl2 + 2h2

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.