(i) 31 g potassium nitrate is needed. (ii) Potassium chloride crystals will separate as the solution cools because its solubility decreases. (iii) Solubility generally increases with temperature, but the increase differs among salts.
Discussion Forum Latest Questions
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.