Which of the following can act both as a Bronsted acid and a Bronsted base?

Which of the following can act both as Bronsted acid and as Bronsted base?

Which of the following can act both as a bronsted acid amd a bronsted base?

Which of the following can act both as Bronsted acid and Bronsted base? (i) HCO_(3)^(-) (ii) NH_(3) (iii) O^(2-) (iv) HCl

Which of the following can act as both Bronsted acid and a Bronsted base? i) HCOO^(-) ii) NH_(2) iii) NH_(3) Iv) HSO_(4)^(-)

Which of the following can acct both as a Bronsted acid as well as a Bronsted base ?

Which of the following can act as Bronsted acid and which as Bronsted base: H_3O^(+), Cl^(-) , NH_3 ?