Purple is defined as a deep, rich shade between crimson and violet, or, more broadly, as a range of hues of color between blue and red, or as a dark color that is a blend of red and blue.
Dry ice is the solid form of carbon dioxide (CO2), a molecule consisting of a single carbon atom bonded to two oxygen atoms. Dry ice is colorless, non-flammable, with a sour zesty odor, and can lower the pH of a solution when dissolved in water, forming carbonic acid (H2CO3).
Yes, but not by displacing it. But, by reducing solubility of oxygen in cold water. Dry ice is - 32C, so it will definitely reduce water temperature and consequently oxygen solubility. And, as mentioned in other answers, oxygen is already sparingly solubile, so it won't make Much of a difference. Views.