The diagram illustrates an experiment used to demonstrate diffusion. Which statement explains why the ammonium chloride ring is seen in the position shown?
- AAmmonia solution only produces a gas which moves until it meets the hydrochloric acid.
- BBoth solutions produce a gas, but ammonia moves quicker than hydrogen chloride because it is lighter.
- CHydrochloric acid produces hydrogen chloride which stays at one end of the tube until the ammonia reaches it.
- DThe two solutions run along the tube until they meet.