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(Delhi 2009) Answer: Tyndall effect : When a beam of light is passed through a colloidal solution and viewed perpendicular to the path of […] If the colloidal particles carry a positive charge, then they move towards the cathode when subjected to an electrical field, while negatively charged colloidal particles move towards the anode. Under the influence of an electrical field, the colloidal particles and the dispersion medium both have a tendency to move towards the oppositely charged electrodes, but the semi-permeable membrane does not allow the passage of the colloidal particles. font-size: 14px;
The current is then switched on. A higher concentration of an electrolyte is needed to coagulate a lyophilic sol than is needed to coagulate a lyophobic sol. ANSWER. Which two chemical mix togather will produce extreme heat and light? Explain the difference between Electrophresis and Electrosmosis. Lyophilic sols, are much more stable than lyophobic sols, and do not get coagulated easily under similar conditions. Why HCl and HI do not take part in anit-markovnikov's rule based reaction, Hi frd. Electro-osmosis is the movement of a dispersion medium under the influence of an electrical field when the movement of colloidal particles is prevented by a suitable membrane. As board is near I am forgetting to study plz help me, Can u pls help me in numericals of chemistry, Create questions or review them from home. e.g., When AgNO 3 and KI … Check important questions and answers for Class 12 Chemistry Board Exam 2020 from Chapter 5 - Surface Chemistry. Apart from exhibiting colour, the Tyndal effect, Brownian motion and colligative properties, colloidal solutions also exhibit electrical properties. The electrical charge on colloidal particles may be due to several reasons. The nature of this charge is the same on all the particles in a given colloidal solution and may he either +ve or -ve. A sol may also be coagulated by simple boiling. This type of coagulation is called mutual coagulation. These questions are based on the latest CBSE Class 12 Chemistry Syllabus. What happen when an emulsion is centrifuged? Posted by Gayathridevi Boopathy 1 day, 16 hours ago, Posted by Sandhya Bhandari 1 day, 21 hours ago, Posted by Sanpreet Kaur 1 day, 20 hours ago, Posted by Garima Sharma 1 day, 21 hours ago, Posted by Prarthana Jacob 1 day, 2 hours ago, Posted by Hrishabmishra Xiib Mishra 1 day, 13 hours ago, .btn {
An important application of electrophoresis is in sewage disposal. display: block;
}, No software required, no contract to sign. This potential is called "electro kinetic potential" or "zeta potential". Charge on colloidal particles Colloidal particles always carry an electric charge. Performance & security by Cloudflare, Please complete the security check to access. Simply apply as teacher, take eligibility test and start working with us. }
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These larger molecules aggregate or coagulate, and then settle down under the force of gravity. Arsenious sulphide sol undergoes coagulation on boiling. Based on the nature of the charge on the colloidal particles, colloidal solutions are classified as positively charged or negatively charged sols. Important Questions for Class 12 Chemistry Chapter 5 Surface Chemistry Class 12 Important Questions Surface Chemistry Class 12 Important Questions Very Short Answer Type Question 1. Your IP: 192.158.224.67 Colloids: Properties Of Colloidal Solutions - II, The combination of two layers of opposite charges around a colloidal particle is called the, This phenomenon is called coagulation or precipitation of the sol, Another method used to bring about coagulation is.