Question

how will you prove that hydrochloric acid contains hydrogen and chlorine. write equations for the reactions.
please answer fast tomorrow I have my chemistry board exams.

Answer 1

for proof of chlorine u have to consider the reaction of conc. HCl with a metallic oxide such as MnO2 or PbO2 . it evolves a gas which is greenish yellow in colour(chlorine) and turns starch iodide paper blue black. the acidic properties of HCL prove the presence of Hydrogen in the acid. the reaction of HCL with any metal liberates hydrogen, which proves the above.

Answer 2

2H+Cl2>2HCl
2 Hydrogen mole + 2 molecules of chloride forms 2 moles of Hydrochloric Acid