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Explain the following terms : (i) Electrophoresis (ii) Coagulation (iii) Dialysis (iv) Tyndall effect. |
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Answer» Solution :(i) Electrophoresis : The existence of charge on colloidal particles is confirmed by electrophoresis experiment. When electric potential is applied across two platinum electrodes dipping in a colloidal solution the colloidal particles MOVE towards one or the other electrode. The movement of colloidal particles under an applied electric potential is CALLED electrophoresis. (ii) Coagulation: The process of settling of colloidal particles is called coagulation of PRECIPITATION of the sol. (iii) Dialysis: It is a process of removing a dissolved SUBSTANCE from a colloidal solution by means of diffusion through a suitable membrane. (iv) Tyndall effect : If a homogeneous solution placed in dark is observed in the direction of light, it appears clear and if it is observed from a direction at right angles to the direction of light BEAM it appears perfectly dark. This effect is known as Tyndall effect. |
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