MCQs On Colloids Quiz

Smoke is considered an aerosol because it is a suspension of solid or liquid particles in a gas. In the case of smoke, it is composed of small particles of carbon, ash, and other substances suspended in air. These particles can be inhaled and can have harmful effects on the respiratory system. Therefore, smoke is classified as an aerosol.

The Tyndall Effect refers to the phenomenon of light scattering in a colloid system. When a beam of light passes through a colloid, the particles in the colloid scatter the light, making the beam visible. This effect is caused by the difference in refractive index between the dispersed phase and the continuous phase of the colloid. The dispersed particles in the colloid are larger than the wavelength of visible light, causing the scattering of light. This effect is commonly observed in everyday situations, such as the visibility of dust particles in a beam of sunlight or the blue color of the sky.

Milk is a colloid system because it consists of small particles of fat and protein dispersed in water. Colloids are a type of mixture where the particles are larger than those in a solution but smaller than those in a suspension. In milk, the fat and protein particles are evenly distributed throughout the liquid, creating a stable colloid system.

The correct answer is solid in gas because smoke is made up of tiny solid particles suspended in a gas medium. When a material burns or undergoes combustion, it produces smoke, which consists of solid particles such as ash, soot, or dust, that are dispersed in the air. Therefore, the dispersed phase is solid particles, and the dispersing medium is the gas in which these particles are suspended.

Colloidal solutions are widely used in milk industries. Milk is an example of a colloidal solution, where fat globules are dispersed in a liquid medium. Colloidal stability is crucial in milk production, as it prevents the separation of fat from the liquid portion. Additionally, colloidal properties such as suspension and emulsion formation are important in the production of various dairy products like cheese, butter, and ice cream. Therefore, the use of colloidal solutions is significant in milk industries for the processing and production of dairy products.

Emulsion is a mixture of two immiscible liquids, where one is dispersed as tiny droplets in the other. The dispersing medium is the continuous phase in which the other liquid is dispersed. In the case of emulsion, the liquid acts as the dispersing medium. Therefore, the correct answer is liquid.

Solid sol is considered to be the strongest colloid because it consists of solid particles dispersed in a liquid or gas medium. The solid particles in a solid sol are usually very small and evenly distributed, resulting in a stable and strong colloid. This type of colloid exhibits high viscosity and is resistant to settling or separation. Solid sols are commonly used in various industries, such as in the manufacturing of paints, ceramics, and pharmaceuticals.

Colloids are heterogeneous mixtures, meaning they consist of two or more phases. They are stable, meaning the particles do not settle out over time. Colloids are also known to be able to pass through filters, as the particles are small enough to pass through the filter medium. However, colloids are not homogeneous, as they do not have a uniform composition throughout.

Margarine is a solid emulsion because it is a mixture of water and oil, where water is dispersed as tiny droplets in the oil phase. Emulsions are colloidal systems in which one liquid is dispersed as small droplets in another immiscible liquid. In the case of margarine, the water droplets are dispersed in the oil phase to create a stable solid emulsion.

The suspended particles can range in size from as small as 1 nanometer to as large as 1000 nanometers.