States of Matter Practice Questions
HSC/SSC (Bangladesh) · HSC Chemistry · 146 free MCQs with instant results and detailed explanations.
146
Total
39
Easy
76
Medium
31
Hard
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Sample Questions from States of Matter
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
Which of the following statements best describes the kinetic molecular theory of gases?
A.
Gas particles are in constant random motion and collisions are elastic.
B.
Gas molecules are tightly packed and can only vibrate in place.
C.
Gas particles have strong intermolecular forces and occupy fixed positions.
D.
Gas particles are at rest and do not move unless acted upon by an external force.
Show Answer & Explanation
Correct Answer: A
Option A correctly describes the kinetic molecular theory, stating that gas particles are in constant random motion and the collisions between them are perfectly elastic, leading to no energy loss.
Q2
Easy
What happens to the volume of a gas when the temperature increases at constant pressure?
A.
The volume decreases.
B.
The volume remains constant.
C.
The volume increases.
D.
The volume becomes unpredictable.
Show Answer & Explanation
Correct Answer: C
According to Charles's Law, the volume of a gas increases with an increase in temperature, provided that the pressure remains constant, leading to option C being the correct answer.
Q3
Easy
Which of the following statements best describes the properties of gases?
A.
Gases have a definite shape and volume.
B.
Gases are compressible and fill the entire volume of their container.
C.
Gases have a high density compared to liquids.
D.
Gases consist of particles that are tightly packed together.
Show Answer & Explanation
Correct Answer: B
Gases are compressible and expand to fill the entire volume of their container, indicating they do not have a definite shape or volume.
Q4
Medium
Which of the following gases would deviate most from ideal behavior at high pressures?
A.
Helium
B.
Carbon Dioxide
C.
Neon
D.
Nitrogen
Show Answer & Explanation
Correct Answer: B
Carbon Dioxide has significant intermolecular forces and a larger molecular size compared to the others, causing it to deviate from ideal gas behavior under high pressure.
Q5
Medium
What happens to the average kinetic energy of gas molecules if the temperature is doubled?
A.
It remains the same.
B.
It doubles.
C.
It increases by a factor of four.
D.
It decreases.
Show Answer & Explanation
Correct Answer: B
The average kinetic energy of gas molecules is directly proportional to the absolute temperature. Thus, doubling the temperature results in doubling the average kinetic energy.
Q6
Medium
When a liquid is heated, what effect does this have on its vapor pressure?
A.
Vapor pressure decreases.
B.
Vapor pressure remains constant.
C.
Vapor pressure increases.
D.
Vapor pressure fluctuates unpredictably.
Show Answer & Explanation
Correct Answer: C
Heating a liquid increases the kinetic energy of its molecules, resulting in more molecules escaping into the vapor phase, which increases vapor pressure.
Q7
Medium
What phase change occurs when a solid directly turns into a gas?
A.
Condensation
B.
Sublimation
C.
Melting
D.
Freezing
Show Answer & Explanation
Correct Answer: B
Sublimation is the phase change where a solid transitions directly to a gas without passing through the liquid phase, like dry ice to carbon dioxide gas.
Q8
Hard
Which of the following statements best explains why gases are highly compressible compared to liquids and solids?
A.
Gases have a fixed volume and shape.
B.
Gas particles are in constant, rapid motion and are far apart.
C.
Gases do not have intermolecular forces.
D.
Gases are denser than liquids.
Show Answer & Explanation
Correct Answer: B
Gas particles are in constant, rapid motion and are far apart, which allows them to be compressed easily. Unlike liquids and solids, the large spaces between gas particles make them highly compressible.
Q9
Hard
If the pressure of a gas is doubled at constant temperature, what will be the effect on its volume according to Boyle's Law?
A.
The volume will be halved.
B.
The volume will double.
C.
The volume will remain the same.
D.
The volume will quadruple.
Show Answer & Explanation
Correct Answer: A
According to Boyle's Law, pressure and volume are inversely related when temperature is constant. If the pressure of a gas is doubled, the volume will be halved.
Q10
Hard
Which of the following statements about the kinetic molecular theory of gases is NOT true?
A.
Gas particles are in constant, random motion.
B.
The volume of gas particles is negligible compared to the volume of the container.
C.
Gas particles attract and repel each other significantly.
D.
The average kinetic energy of gas particles is directly proportional to the temperature of the gas.
Show Answer & Explanation
Correct Answer: C
Statement C is not true; according to the kinetic molecular theory, gas particles do not attract or repel each other significantly, which allows them to move freely and occupy space.
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States of Matter — HSC/SSC (Bangladesh) HSC Chemistry Practice Questions Online
This page contains 146 practice MCQs for the chapter States of Matter in HSC/SSC (Bangladesh) HSC Chemistry. The questions are organized by difficulty — 39 easy, 76 medium, 31 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.