Chief Function Of HCl Is (1) To Maintain Low Ph To Promote Growth Of Microorganisms (2) To Facilitate Absorption (3) To Maintain Low Ph To Activate Pepsinogen To Form Pepsin (4) To Dissolve Enzymes Secreted In Stomach

Answer: (3) To maintain low pH to activate pepsinogen to form pepsin 

Gastric juice comprises 5 components out of which pepsin is the principal enzyme involved in protein digestion. Pepsin breaks down proteins into tiny peptides and amino acids that will be conveniently absorbed by the small intestine. Hydrochloric acid (HCl) , which is also a part of gastric juice, serves a pivotal function of generating the pH required for pepsin activity. The cells attached on the wall form HCl by secreting chloride and hydrogen ions. Pepsin comes into its active form as soon as pepsinogen and HCl come together.