Question

carbonic acid gives an acid salt but hydrochloric acid does not

Answer 1

Carbonic acid is a diprotic acid. On Neautralisation it still consist of one H that can be displaced. This wont happen in mono protic acid like HCl
Or The other way of explanation
Carbonic acid is a dibasic acid and on nuetralisation is still left with a hydrogen ion while HCl being a monobasic acid is left with no hydrogen ions.
Hope it helps

Answer 2

Answer:

Carbonic acid is diabetic so it ionized in 2 steps.So it forms a salt.