Question

1. filtration is used to separate mixtures based on

density

boiling point

melting point

particle size

Explanation:

Filtration is a separation technique. In filtration, a filter (like filter paper) is used. The mixture is poured over the filter. The liquid (or smaller particles if it's a solid - solid mixture) passes through the filter pores, while the larger solid particles are retained on the filter. This separation is based on the difference in particle size. For example, when separating sand (larger particles) from water (smaller particles), filtration works because sand particles are too big to pass through the filter pores. Density is used in separation techniques like centrifugation (for immiscible liquids or solids - liquids where density difference is key). Boiling point is used in distillation (separating liquids based on their different boiling points). Melting point is not a direct basis for filtration.

Answer:

particle size