Classify the following into true solution, colloid and suspension:
sodium chloride in water, oil in water, sand in water, milk, copper sulphate dissolved in water, fog

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Solution

The substances present in the question can be categorised as a true solution, colloid and suspension
True solution: Solute particles dissolved in solvent and form solution. These particles are not visible to our naked eye. Dissolved particles have a size of less than 1 nm
Colloids: In this type of substance dispersed phase and dispersion medium are present and they show a light scattering phenomenon called the Tyndall effect. Particles have a size range of 1-1000 nm
Suspension: Particles having a size greater than 1000 nm are suspended in the medium which is visible with our naked eye and settle down after sometime
So, substances can be classified as follows:
True solution: sodium chloride in water, copper sulphate dissolved in water
Colloids: milk, fog, oil in water
Suspension: sand in water

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