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@, , The high electro-negativity difference of oxygen and hydrogen in water molecules makes it, excellent polar solvent., , The shape of water molecules is V shape or bent., , The density of ice is less than the density of water, which makes ice float on water., , Hard and Soft water, , Water is classified as soft and hard, depending on the type of dissolved salts and behavior with, soap., , Hard water can be further classified as temporary and permanent hard water., , Temporary hardness of water is caused due to the presence of soluble calcium and magnesium, hydrogen carbonate., , Temporary hardness of water can be removed by boiling and by using Clark’s method., , Permanent hardness of water is due to the presence of salts of magnesium and calcium in the form, of chlorides and sulphates., , Permanent hardness of water can be removed by treating with washing soda, Calgon’s Method,, lon-Exchange Method and Synthetic Resins method., , Hydrogen Peroxide, , Hydrogen peroxide is a very pale blue liquid and appears colourless in a dilute solution., , The hydrogen peroxide molecule is non-planar and has an open book structure.