question_answer

Ammonia and hydrochloric acid gases are prepared at the two extreme corners in the laboratory. Which gas will reach first to a person in the centre of the laboratory?

Answer:

                Ammonia gas will reach first to a person in the centre of the laboratory because it is lighter than hydrochloric acid gas. This is according to the Graham's law of diffusion which states that the rate of diffusion of a gas under given conditions of temperature and pressure is inversely proportional to the square root of its density.