Top States of Matter Questions for NEET
The chapter States of Matter (Gaseous and Liquid State) is one of the most concept-heavy yet scoring topics in NEET Chemistry. Questions are frequently asked from gas laws, kinetic theory, real gases, and deviations from ideal behavior. Mastering the Top 5 States of Matter Questions ensures that you can handle both theoretical and numerical problems with confidence.
Why States of Matter is Important for NEET
Every year, NEET includes at least one direct or numerical question from this chapter. Most questions are formula-based and NCERT-oriented. By practicing the Top 5 States of Matter Questions, you can secure easy marks while strengthening your understanding of thermodynamic behavior of gases.
Top 5 States of Matter Questions (Important PYQs)
Question 1: Ideal Gas Equation
The relationship between pressure, volume, and temperature for an ideal gas is given by:PV=nRT
Which of the following increases pressure when temperature is constant?
A. Increase in volume
B. Decrease in moles
C. Decrease in volume
D. Increase in temperature
Answer: C
Explanation:
At constant temperature, pressure is inversely proportional to volume (Boyle’s law). Decreasing volume increases pressure. This is one of the most fundamental concepts in the Top 5 States of Matter Questions.
Question 2: RMS Velocity of Gas
The root mean square velocity of gas molecules is given by:
vrms=M3RT
Which factor increases RMS velocity?
A. Increase in molar mass
B. Decrease in temperature
C. Increase in temperature
D. Increase in pressure
Answer: C
Explanation:
RMS velocity is directly proportional to the square root of temperature. Higher temperature means faster molecular motion. This concept is frequently tested in Top 5 States of Matter Questions.
Question 3: Real Gas Behavior
Real gases deviate from ideal behavior at:
A. High temperature and low pressure
B. Low temperature and high pressure
C. Low temperature and low pressure
D. High temperature and high pressure
Answer: B
Explanation:
At low temperature and high pressure, intermolecular forces and molecular volume become significant, causing deviation. This is a key conceptual point in the Top 5 States of Matter Questions.
Question 4: Compressibility Factor
Compressibility factor (Z) is defined as:Z=nRTPV
For an ideal gas, Z is:
A. 0
B. 1
C. Greater than 1
D. Less than 1
Answer: B
Explanation:
For ideal gases, Z = 1 at all conditions. Deviations occur when Z ≠ 1. Understanding this is essential for solving Top 5 States of Matter Questions.
Question 5: Liquefaction of Gases
Which condition favors liquefaction of gases?
A. High temperature and low pressure
B. Low temperature and high pressure
C. High temperature and high pressure
D. Low temperature and low pressure
Answer: B
Explanation:
Lowering temperature reduces kinetic energy, and increasing pressure brings molecules closer, aiding liquefaction. This is a commonly asked concept in Top 5 States of Matter Questions.
Key Concepts You Must Remember
To master the Top 5 States of Matter Questions, you should focus on gas laws (Boyle’s, Charles’, Avogadro’s), ideal gas equation, kinetic theory, and real gas behavior. Remember that deviations occur due to intermolecular forces and finite molecular volume. Liquefaction and critical temperature are also important NCERT-based topics.
Additional Practice Questions (Concept-Based Rapid Revision)
Question 6
Which gas law states that volume is directly proportional to temperature?
Answer: Charles’ law
Question 7
What happens to pressure when volume doubles at constant temperature?
Answer: Pressure becomes half
Question 8
Which gas deviates most from ideal behavior?
Answer: Gas with strong intermolecular forces
Question 9
What is critical temperature?
Answer: Temperature above which gas cannot be liquefied
Question 10
Which property depends only on temperature?
Answer: Average kinetic energy
Additional Practice Questions with Solutions
Question 11
Why do real gases behave ideally at high temperature?
Solution:
At high temperature, kinetic energy dominates intermolecular forces, making gases behave ideally.
Question 12
Why does pressure increase when temperature increases?
Solution:
Higher temperature increases molecular collisions with container walls, increasing pressure.
Question 13
Why are lighter gases faster?
Solution:
RMS velocity is inversely proportional to square root of molar mass.
Question 14
Why is liquefaction difficult at high temperature?
Solution:
Molecules have high kinetic energy, preventing them from coming close enough to condense.
Question 15
Why is Z less than 1 for some gases?
Solution:
Attractive forces dominate, reducing effective pressure.
Final Revision Tips
To excel in the Top 5 States of Matter Questions, practice numerical problems regularly and memorize key formulas. Focus on conceptual clarity rather than rote learning. Revisit the Top 5 States of Matter Questions multiple times to ensure speed and accuracy in NEET.
Consistent practice of the Top 5 States of Matter Questions will help you confidently solve both theoretical and numerical questions in the exam.