Chapter Exam

Chapter-1 States of Matter — Online MCQ Test

Q: Which state of matter has particles that are tightly packed in a fixed arrangement with no freedom of movement?

Answer: C. Solid — Solids have particles arranged in a fixed, regular lattice structure with very limited movement, giving them a definite shape and volume.

Q: What is the process by which a solid converts directly into a gas without passing through the liquid state?

Answer: C. Sublimation — Sublimation is the direct phase transition from solid to gas, commonly observed in dry ice (solid CO₂) at room temperature.

Q: A perfume bottle is opened in one corner of a room. After some time, the smell spreads throughout the entire room. This phenomenon is best explained by which process?

Answer: B. Diffusion — Diffusion is the spontaneous movement of particles from an area of high concentration to low concentration, allowing perfume vapor to spread throughout the room.

CHEMISTRY · Grade 10 · IGCSE cambridge

Practice Chapter-1 States of Matter with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 CHEMISTRY. This chapter covers: Solids liquids and gases the kinetic particle theory diffusion and changes of state.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-1 States of Matter — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 CHEMISTRY — Chapter-1 States of Matter, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which state of matter has particles that are tightly packed in a fixed arrangement with no freedom of movement?

A. Gas
B. Liquid
C. Solid ✓
D. Plasma

Answer: C. Solid
Solids have particles arranged in a fixed, regular lattice structure with very limited movement, giving them a definite shape and volume.

What is the process by which a solid converts directly into a gas without passing through the liquid state?

A. Melting
B. Evaporation
C. Sublimation ✓
D. Condensation

Answer: C. Sublimation
Sublimation is the direct phase transition from solid to gas, commonly observed in dry ice (solid CO₂) at room temperature.

A perfume bottle is opened in one corner of a room. After some time, the smell spreads throughout the entire room. This phenomenon is best explained by which process?

A. Melting
B. Diffusion ✓
C. Condensation
D. Sublimation

Answer: B. Diffusion
Diffusion is the spontaneous movement of particles from an area of high concentration to low concentration, allowing perfume vapor to spread throughout the room.

Why is diffusion faster in gases than in liquids?

A. Because gas particles are smaller than liquid particles
B. Because gas particles move with higher average speeds and have greater distances between them ✓
C. Because gases have stronger intermolecular forces
D. Because liquids are denser than gases

Answer: B. Because gas particles move with higher average speeds and have greater distances between them
Gas particles move much faster and have more space between them, allowing them to spread and mix more rapidly than liquid particles which are closely packed.

When ice at -5°C is heated, it first melts to liquid water at 0°C, then the liquid water is heated to 25°C. During which stage(s) is the average kinetic energy of the particles increasing?

A. Only during the melting process from ice to water
B. Only during the heating of liquid water from 0°C to 25°C
C. During the heating of ice and during the heating of liquid water, but NOT during melting
D. During all three stages: heating ice, melting, and heating water ✓

Answer: D. During all three stages: heating ice, melting, and heating water
Average kinetic energy increases during all heating stages. Even during phase changes (melting), kinetic energy of particles in the new state is higher than in the previous state.

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Chapter-2 Atomic Structure