You will need two glasses, a little salt, sand, spoons, and water.
Take half a glass of water and add half a teaspoon of salt to it. Stir it well. What do you find? Repeat this with the sand, using another glass.
Salt is soluble in water, while sand is insoluble.
In your list find two other solids which dissolve in water.
Paper, spirit, branch of a tree, glass tumbler, coin, steel plate, piece of cork, sandpaper, talcum powder, butter, milk, air, copper wire, honey, shampoo, cotton wool, windowpane, soap, dough for chapatti, a lump of plasticine, water, lime juice, oil, smoke, steam, petrol, kerosene, stone, mirror, iron nail, salt, sugar, ice, flour, drinking straw, plastic ruler, cooking gas, aluminum foil, rubber band, oxygen, sand;
Name two solids that are insoluble in water and two that are soluble.

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Solution

Soluble solids are substances that dissolve in a given liquid it forms a solution.
Insoluble solids are those solids that do not dissolve in water.
On adding these insoluble solids to the water they either float or sink but do not mix with it.
Two other solids dissolve in water: Sugar and cotton wool.
Two other solids which insoluble in water: are flour, and talcum powder.

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