Which of the following can act as Bronsted acid as well as Bronsted base?

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

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

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 act both as a Bronsted acid and a Bronsted base?

Which of the following behave both as Bronsted acids as well Bronsted base?

Which of the following would act as Bronsted acid?

Which of the following can act both as a Bronsted acid and a Bronsted base ? (a) HCO_3^- , (b) O^2^- , (c) NH_3 , (d) H_2O , (e) HS^-