Question

Below are given four species

(i) hcl
(ii)nh3
(iii) h3+o
(iv) cn-
Out of these species, the Bronstead-L.owry acids are
A. (i) and (II)
B. (ii) and (iii)
C. (i) and (iii)
D. (i) and (iv)
​

Answer 1

hcl is the bronsted acid in which it dissolves in water to produce hydronium ion .

Answer 2

I think, it is Bronsted acid and (iv) is Cl⁻ not Cn⁻

So, the answer is:

HCl

and Conjugate acid base pair is

(D) (i) and (iv)

and Bronsted acid base pair is

(A) (i) and (ii)

HCl  Bronsted acid because, it is proton donor or it donats the hidrogen proton to the water and dissolves in water and Cl⁻ is the conjugate base.

When HCl reacts with the Bronsted base NH₃ then it forms the conjugate acid NH₄⁺ and the conjugate base Cl⁻.