True color is dissolved in water (in solution) and can be removed by filtration.

True color is dissolved in water (in solution) and can be removed by filtration.

• A. TRUE
• B. FALSE
• C. Only by boiling
• D. Not affected by filtration

Answer: (B)

Color that is truly dissolved in water exists as individual molecules or ions in solution, not as separate particles. Filtration works by trapping particles you can see or that are suspended, but it can’t pull dissolved substances out of solution. Boiling won’t reliably remove dissolved color either, since many color-causing compounds are nonvolatile and stay in solution while the water evaporates. To remove dissolved color, you need treatments that target dissolved substances—such as adsorption on activated carbon, coagulation with a coagulant followed by filtration, oxidation to break down the color-causing compounds, ion exchange, or advanced membrane processes like reverse osmosis. Because filtration alone only handles particulates, the statement about true color being removable by filtration isn’t correct.

Color that is truly dissolved in water exists as individual molecules or ions in solution, not as separate particles. Filtration works by trapping particles you can see or that are suspended, but it can’t pull dissolved substances out of solution. Boiling won’t reliably remove dissolved color either, since many color-causing compounds are nonvolatile and stay in solution while the water evaporates.

To remove dissolved color, you need treatments that target dissolved substances—such as adsorption on activated carbon, coagulation with a coagulant followed by filtration, oxidation to break down the color-causing compounds, ion exchange, or advanced membrane processes like reverse osmosis. Because filtration alone only handles particulates, the statement about true color being removable by filtration isn’t correct.