What are the two types of color observed in water?

The two types of color observed in water are classified as apparent and true. Apparent color refers to the color seen in water samples that may include both the intrinsic color of the water itself and additional colors imparted by substances dissolved or suspended in the water, such as organic materials or algae. True color, on the other hand, is the color of the water after any suspended particles have been removed, revealing the underlying hue from dissolved substances alone. This distinction is important for water treatment and quality assessments, as it helps operators identify how much color is due to particulates versus dissolved compounds.

The other options do not accurately describe the classification of color in water. For instance, organic and inorganic refer to different types of compounds present in water rather than color types. Defined and undefined are too vague and do not specifically categorize color. Similarly, visible and invisible do not pertain to the color observed in water, as all color can be visible or relate to the presence of contaminants not necessarily linked to color perception. Thus, the classification of apparent and true color provides a more precise understanding of the color characteristics of water.