Is Matter Around Us Pure Test - 10

The emulsifier which stabilizes milk emulsion is called Casein. Casein is found in mammalian milk, making up 80% of the protein in cow milk and between 20% and 45% of the protein in human milk.

A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. The particle size of suspension is greater than 100 nm. So, particle size of substance ‘P’ present in water will be the suspension.

Emulsions are an example of colloids composed of tiny particles suspended in another immiscible (unmixable) material. An emulsion is a suspension of two liquids that usually do not mix together. These liquids that do not mix are said to be immiscible.

Scattering of beam of light when it passes through a solution is called tyndall effect.  The particles scatter a beam of light passing through colloidal solution and the path of light is visible in the solution.

A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. The size of particle is more than 100nm. The solute particles settle down when a suspension is left undisturbed, which means that a suspension is unstable.

The particle size in colloidal solution lies in the range 1nm to 100nm. 1nm = 10^-7 cm and 100nm = 10^-5 cm. The size of particles in colloidal solution ranges from 10^-5 cm to 10^-7. less than 10^-5is true solution and more than 10^-7is suspension.

Colloidal solution is a heterogeneous mixture. The solute particles cannot be separated by filtration. The solute particles do not settle down and the solution is stable.
Air is a mixture, salt solution and sugar solution are a true solution and milk is a colloid having disperse phase of protein and fat in dispersing medium of water and other substance.

(1) Brass is an alloy made primarily of copper and zinc. So Solid in solid.
(2) Ammonia is gas and water is liquid. So, ammonia in water is gas into liquid.
(3) Vinegar is a liquid consisting of about 5–20% acetic acid, water, and other trace chemicals, which may include flavorings. So, liquid in liquid.
(4) Amalgam definition, an alloy of mercury with another metal or metals. So, liquid in solid.

(1) The particle size in colloidal solution lies in the range 1nm to 100nm.
(2) Suspension is mixture in which a substance will not dissolve in another and quickly separated if left out to stand.
(3) Solution having maximum amount of solute dissolved in 1 litre of solvent at particular temp are saturated solution.
(4) Solution is a homogeneous mixture of two or more substances in which substance dissolved (solute) in solvent has the particle size of less than 10-9 m or 1 nm.

(1) An aerosol is a type of colloid in which liquid is the dispersed phase and gas is the dispersion medium. Examples include fog, clouds, mist, etc.
(2) In oil-in-water emulsions, an oil acts as the dispersed phase while water acts as the dispersion medium.
(3) Foam is a type of colloid in which gas is the dispersed phase and solid is the dispersed medium. Examples include foam, rubber sponge, whipped cream, etc.
(4) Sol: It is a type of colloid in which solid is the dispersed phase and liquid is the dispersed medium. Examples include milk of magnesia, mud, paint etc.