Suspension - class-IX

A suspension is a heterogeneous mixture in which very fine particles of a solid are dispersed in any medium (liquid or gas). Fine particles of the solid remain suspended in the medium.

Following are the characteristics properties of suspensions

i) Heterogeneous nature: a suspension is a heterogeneous system.

ii) Visibility: the particles in a suspension can be seen with naked eyes or under a simple microscope.

iii) Particle Size: in a suspension, the size of the particles is of the order of 10-7 make or larger.

iv) Sedimentation: the particles in a suspension travel tendency to settle down. Very fine particles, however, remain suspended in the medium.

v) Separation by filtration: Larger particles in a suspension can be separated from the liquid or air by the filtration. 

The correct option is (c).
On dissolving chalk powder in water,a suspension is obtained.The mixture is stirred for sometime to ensure the uniform dispersion of chalk powder in water.
Suspension is a heterogeneous mixture of particles from which the particles are settled down with time.Chalk powder does not dissolve in water at all.It just forms suspension in water and after some time settles down under the influence of gravity. 

True solutions have solute particles with size less than 1 nm whereas suspensions have size more than 100 nm.
Colloids have size between 1 to 100 nm.

A suspension is a heterogeneous mixture in which very fine particles of a solid dispersed in any medium (liquid/gas). In any suspension, fine particles of the solid remain suspended in the medium.

A suspension is a heterogeneous mixture in which very fine particles (about 10-5m in size) of solid are dispersed in any medium (liquid or gas). In suspension, the solute particles are visible to the naked eye, and remain suspended throughout the bulk of the medium. The Tyndall effect is observed in this mixture.

Muddy pond water, smoke coming out of a chimney, chalk-water mixture, coarse lime particles in water are examples of suspension.

A suspension is a heterogeneous mixture containing solid particles that are sufficiently large for sedimentation. Usually they must be larger than one micrometer.

Unlike colloids, suspensions will eventually settle. The suspended particles are visible under a microscope and will settle over time if left undisturbed. This distinguishes a suspension from a colloid, in which the suspended particles are smaller and do not settle. Colloids and suspensions are different from solutions, in which the solvent and solute are homogeneously mixed.

Putting two or more liquids together creates an emulsion if the liquids do not mix. If a liquid is suspended in another liquid, it is called an emulsion.

Suspensions are "murky" or "opaque". They do not transmit light. Suspensions separate on standing. The mixture of particles can be separated by filtration.

A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate. In the atmosphere these consist of fine dust and soot particles, sea salt, biogenic and volcanogenic sulfates, nitrates, and cloud droplets.

A key characteristic of a suspension is that the solid particles will settle and separate over time if left alone. An example of a suspension is a mixture of water and sand. When mixed up, the sand will disperse throughout the water. If left alone, the sand will settle to the bottom.

Paste is suspension of solid in liquid.

Suspension is the heterogeneous mixture of two or more substances. In suspension, particles are suspended throughout in bulk and can be seen by naked eyes.

When suspension is left for some time, particles get settled in bottom. Therefore, suspension is not stable.

Suspension shows Tyndall effect because of their large size of particles. Particles of suspension are large enough to scatter rays of light and path of ray is visible through a suspension. 

Mixtures are called foam when liquid is present as dispersing medium and gas is dispersed medium. For example, shaving cream, soap bubbles, etc.

A suspension of liquid droplets or fine solid particles in a gas is called an aerosol or particulate. Aerosol is of two types: liquid aerosol and solid aerosol.

Colloidal solutions are heterogeneous mixture of two or more substances. They appear homogeneous. The size of colloids is between the size of particles of solution and suspension, i.e., between 1 nanometer to 1000 nanometer.

Apparatus used to sediment particles in supension is centrifuge.
Calorimeter is used to measure the heat absorbed or released by a reaction.
Barometer is used to measure pressure.
Balance is used to measure weight of a substance.
Battery is used to provide electricity.

Smog is a colloidal solution in which the dispersed phase is solid and dispersion medium is gas along with some water droplets dispersed into the air.

Milk is an emulsion of dispersed phase as a liquid in the dispersion medium as a liquid. This makes A-4, excludes Option B and D from answer choice.
Cloud is aerosol where dispersed phase is liquid and the dispersion medium is gas, Thus this makes B-2.
Paint is a solid phase in liquid medium makes C-1 and Jellies are a liquid phase in solid medium makes D-5.
Thus, option A is correct.

Any molecule which helps in decreasing the surface tension that is the inter facial tension between the two surfaces of liquids or solid-liquid surface is known as surfactants. Some common examples are Soaps and Detergents.
hence the answer is true

The main difference between a conventional liquid paint and a powder coating is that the powder coating does not require a solvent to keep the binder and filler parts in a liquid suspension form while liquid paints require.

Colour of colloidal solution depends upon particle size.
The colour of colloidal solution changes with size of particle, eg, as particle size increases, the colour of gold solution changes from red to blue and finally to golden.