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Matter in Our Surrounding Video Lecture | General Awareness for SSC CGL

FAQs on Matter in Our Surrounding Video Lecture - General Awareness for SSC CGL

1. What are the three states of matter, and how do they differ from each other?

Ans. The three states of matter are solid, liquid, and gas. Solids have a definite shape and volume due to closely packed particles that vibrate in place. Liquids have a definite volume but take the shape of their container, with particles that are close together but can move past one another. Gases have neither a definite shape nor volume, as their particles are far apart and move freely, filling the available space.

2. What factors can change the state of matter?

Ans. The state of matter can be changed by altering temperature and pressure. For example, heating a solid can cause it to melt into a liquid, while cooling a gas can lead to condensation into a liquid. Increasing pressure can compress gases into liquids or solids, while decreasing pressure can allow solids or liquids to change into gases through sublimation or evaporation.

3. What are the characteristics of plasma, and how is it different from other states of matter?

Ans. Plasma is considered the fourth state of matter and consists of ionized gases with free-moving charged particles. Unlike solids, liquids, and gases, plasma has no fixed shape or volume and conducts electricity. It is formed at high temperatures when atoms lose electrons, resulting in a mixture of ions and electrons. Plasma is commonly found in stars, including the sun.

4. Can matter change from one state to another without changing its chemical composition?

Ans. Yes, matter can change from one state to another without altering its chemical composition. For example, when water (H₂O) freezes to form ice, it retains its chemical identity despite changing from a liquid to a solid. Similarly, when ice melts back into water, the chemical composition remains the same.

5. What role do intermolecular forces play in determining the state of matter?

Ans. Intermolecular forces are the attractive forces between molecules and play a crucial role in determining the state of matter. In solids, strong intermolecular forces keep particles closely packed, resulting in a definite shape. In liquids, weaker forces allow particles to slide past one another, giving them a definite volume but not a fixed shape. In gases, very weak intermolecular forces enable particles to move freely and occupy the entire volume of their container.

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Oct 18, 2025 Last updated

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