Which molecules is amphoteric? a) nh4+b) h2oc) h2co3-d) h2so4

Amphoteric oxides include lead oxide and zinc oxide, among many others. One type of amphoteric species are amphiprotic molecules, which can either donate or accept a proton (H+). Examples include amino acids and proteins, which have amine and carboxylic acid groups, and self-ionizable compounds such as water.