Tag: nature of matter

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

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.

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.

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.

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.