Question

Which of the following is amphoteric?
H20
H30-
H+
O2-

Answer 1

the answer is H20

Hope this helps

have  a nice day :)

Answer 2

H20

Both NH3 and H2O are amphoteric (they have H atoms that can be donated as H+ ions and thus act as acids and lone-pair electrons that can accept an H+ and thus act as bases). Thus, either NH3 or H2O can act as an acid or a base.