Explain Tyndall effect?

Colloidal solution or sol consists of fine particles invisible to naked eyes. However, when this solution is placed against a dark background and a strong beam of light is passed through it, the light scattered by them can be observed through the ultramicroscope. The path of light can be viewed from a direction at a right angle to that of incident light. The Phenomenon of scattering of light by sol particles is called Tyndall effect. It confirms the heterogeneous nature of the colloidal solution.

What is Brownian movement ?

The Brownian movement in a colloidal system is caused by the unequal bombardment of the molecules of the dispersion medium on the colloidal particles. When more molecules strike the particles on one side, the direction of the motion of particles changes. This is only visible through ultramicroscope. In colloidal solutions, the colloidal particles are in constant zig-zag motion known as Brownian motion. This phenomenon was first observed by Sir Robert Brown in the year 1827.

E M B I B E

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 8

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The protective action of different colloids is compared in terms of .

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Important Questions on Surface Chemistry

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 9

The movement of dispersion medium under the influence of an electric field is called _____.

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 10

The lyophilic colloids which stabilise a lyophobic sol are known as _____.

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 11

The phenomenon of scattering of light by colloidal particles is referred to as _____.

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 13

On adding a few drops of dilute ferric chloride solution to freshly precipitated ferric hydroxide, a red colloidal solution is obtained. The phenomenon is known as _____.

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 14

Alum is widely used for water purification because it _____ the mud particles.

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 5 - Surface Chemistry>REVIEW EXERCISES>Q 15

By using light, a colloidal solution can be differentiated from a true solution by _____ effect.

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