Distillation is effective because acetone and water have sufficiently different boiling points. Acetone boils at about 56 °C, while water boils at 100 °C, allowing acetone to vaporise first and separate.
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Yes, cooking oil and water form separate layers because they are immiscible and oil is less dense. Oil forms the upper layer. A separating funnel can separate the two layers by draining water first.
Option (IV) is correct. Muddy water, milk and blood are heterogeneous mixtures, while brass is a homogeneous mixture because its components are uniformly distributed throughout the mixture as distinct phases in all parts of it.
Bright rays of sunlight become visible when light passes through small gaps between leaves because dust and smoke particles in the air scatter the light. This scattering makes the path of the light beam visible.