ANS:B - solid dispersed in gas

When we refer to a solid dispersed in a gas, we're describing a mixture where solid particles are suspended throughout a gas medium. Here's an explanation:

1. Solid Particles: These are tiny pieces of solid matter that are dispersed throughout the gas. These particles can vary in size, ranging from nanometers to micrometers, and may consist of various materials such as dust, soot, ash, pollen, or other solid contaminants.
2. Gas Medium: The gas medium refers to the substance in which the solid particles are suspended. This is typically air, but it can also be another gas such as nitrogen, oxygen, or carbon dioxide, depending on the specific situation.
3. Dispersion: The solid particles are distributed throughout the gas medium, creating a mixture where the solid phase (particles) is dispersed within the gas phase. This dispersion can occur due to various mechanisms such as mechanical agitation, turbulent flow, or natural processes like wind or diffusion.
4. Properties: The properties of a solid dispersed in a gas mixture depend on factors such as the size, shape, and concentration of the solid particles, as well as the properties of the gas medium. For example, the presence of solid particles can affect the optical properties of the mixture, leading to phenomena like haze or visibility reduction. Solid particles can also influence the thermal conductivity, electrical conductivity, and chemical reactivity of the gas mixture.
5. Examples: Examples of solid dispersed in gas mixtures include smoke, airborne dust, aerosols, and particulate emissions from industrial processes, combustion engines, wildfires, or construction activities. These mixtures are encountered in various environments and can have implications for air quality, health, environmental pollution, and climate change.

• Smoke consists of tiny particles of solid matter suspended in the air. These particles are generated by incomplete combustion of organic matter, such as wood, coal, or oil.
• When combustion occurs, solid particles are formed due to the incomplete oxidation of carbon and other organic compounds present in the fuel.
• These solid particles, along with other substances like ash and soot, become suspended in the air as fine particulate matter, creating the visible plume known as smoke.
• Since smoke is composed of solid particles dispersed throughout a gas (air), it is classified as an example of a solid dispersed in a gas.
• The particles in smoke can vary in size, composition, and density, depending on factors such as the type of fuel burned, combustion conditions, and environmental factors.
• Smoke is commonly encountered in various contexts, including industrial processes, wildfires, and domestic activities such as cooking and smoking.