Let us understand what existing together physically means. For example, if you look at the polluted water under a microscope, you can clearly see the dangerous chemicals.

So, in a mixture, the different matter particles are just mixed together. They do not become a different matter particle. Only in a chemical reaction do matter particles combine to form a different matter particle.
Which of the following is a mixture?
  • A: A cup of tea
  • B: A chain made only of gold
  • C: Air in the atmosphere
  • A and B
  • A and C
  • A only
  • C only