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(i)Elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.
(ii)When a beam of light is passed through a colloidal solution, then light scatter from the particles. This is known as the Tyndall effect. This scattering of light illuminates the path of the beam in the colloidal solution. ... This is known as the Tyndall effect.
(iii)Oxygen in water. Carbon dioxide in water – a less simple example, because the solution is accompanied by a chemical reaction (formation of ions).
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