Question 14 Marks
Read the following text carefully and answer the questions that follow:
Homogeneous mixtures are regarded as solutions or true solutions. Heterogeneous mixtures are of two types. These are suspensions and colloidal solutions. These differ in the size of the particles responsible for the difference in their properties. In a suspension, the particle size is more than $10^{-5} \ cm$ whereas in a colloidal solution, it ranges between $10^{-5} \ cm$ to $10^{-7} \ cm$. The two phases which constitute colloidal solutions, are dispersed phase and dispersion medium. Based upon their nature, the colloidal solutions are classified into eight types. The mixture of the non$-$reacting gases is always homogeneous irrespective of their nature. Therefore, it is not a colloidal solution.
$i.$ Scattering of light occurs when a beam of light is passed through Blood. Why?
$ii.$ What is Tyndall effect?
$iii.$ What is called colloidal solution?
$OR$
Give an example of colloidal solution and identified their dispersed phase and dispersion medium?
Homogeneous mixtures are regarded as solutions or true solutions. Heterogeneous mixtures are of two types. These are suspensions and colloidal solutions. These differ in the size of the particles responsible for the difference in their properties. In a suspension, the particle size is more than $10^{-5} \ cm$ whereas in a colloidal solution, it ranges between $10^{-5} \ cm$ to $10^{-7} \ cm$. The two phases which constitute colloidal solutions, are dispersed phase and dispersion medium. Based upon their nature, the colloidal solutions are classified into eight types. The mixture of the non$-$reacting gases is always homogeneous irrespective of their nature. Therefore, it is not a colloidal solution.
$i.$ Scattering of light occurs when a beam of light is passed through Blood. Why?
$ii.$ What is Tyndall effect?
$iii.$ What is called colloidal solution?
$OR$
Give an example of colloidal solution and identified their dispersed phase and dispersion medium?
Answer
View full question & answer→$i.$ Since blood is a colloid, so tyndall effect is observed when a beam of light is passed through it since the dispersed particles of a colloid are large, deflect light.
$ii.$ The phenomenon by which the colloidal particles scatter light is called Tyndall effect. If light is passed through a colloid the light is scattered by the larger colloidal particles and the, beam becomes visible.
$iii.$ Colloidal solutions area mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.
$OR$
Fog: Liquid $($water drops$)$ acts as dispersed phase and gas $($air$)$ as the dispersion medium.
$ii.$ The phenomenon by which the colloidal particles scatter light is called Tyndall effect. If light is passed through a colloid the light is scattered by the larger colloidal particles and the, beam becomes visible.
$iii.$ Colloidal solutions area mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.
$OR$
Fog: Liquid $($water drops$)$ acts as dispersed phase and gas $($air$)$ as the dispersion medium.
