Question

what is the role of acid in our stomach

Answer 1

The hydrochloric acid in human stomach destroys any kind of bacteria ingested with food.
It creates an acidic medium facilitating the action of Pepsin enzyme, which acts on proteins present in food.

Answer 2

1)It creates acidic medium for the action of pepsin.
2)It kills unwanted microbes(pathogens).
3)It inhibits the action of amylase like enzymes in stomach.