NTA will shortly release the JEE Main Syllabus 2025 at jeemain.nta.ac.in. Last Year, the complete syllabus of JEE Main underwent some major changes. According to the latest syllabus guidelines, the weightage of Physics has dropped to 22.5%. Due to these changes in the syllabus, certain shifts in chapter-wise weightage have been observed. Equilibrium are among such topics. It’s among the least weightage topics in JEE Main Physics Syllabus 2025. This chapter holds 1.39% weightage in the whole syllabus.
- Equilibrium Is a part of the General Physics section, and every year around 2-3 questions are asked from this chapter. Due to the drop in weightage, you can expect 1-2 questions in JEE Main 2025.
- Equilibrium in JEE Mains Physics Syllabus 2025 covers all the basic concepts on units and measurements, fundamentals of units, dimensions etc.
Aspirants consider Equilibrium as one of the Easiest Chapters in Physics for JEE Main 2025. Even though this chapter has the least weightage in the syllabus, to develop a strong foundation in physics, this particular chapter plays a pivotal role. Hence the candidates need to develop a clear understanding of this chapter. The list of most asked questions from this chapter will help the students with their preparation.
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JEE Main Physics Syllabus Breakdown
Equilibrium JEE Mains Questions -
List Of Most Asked Questions With Solutions
In the (JEE) Main, the topic of Equilibrium often features questions that have appeared multiple times in previous years. Many questions in this section are either repeated or follow similar patterns, with only minor changes, such as different numerical values or slight modifications in wording.Certain questions have been repeated as many as five times.
Here are some of the most frequently asked and repeated questions:
Question 1:
Which of the following statements about equilibrium is true? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) The rate of the forward reaction equals the rate of the reverse reaction
B) Concentrations of reactants and products are equal
C) The system must be at a constant temperature
D) Equilibrium can only be established in closed systems
Solution:
The rate of the forward reaction equals the rate of the reverse reaction at equilibrium. Correct answer is A.
Year: 2023
Question 2:
What is the equilibrium constant (Kc) for the reaction 2A ⇌ B? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) [B]/[A]^2
B) [A]^2/[B]
C) [B]/[A]
D) [A]/[B]
Solution:
The equilibrium constant Kc for the reaction is [B]/[A]^2. Correct answer is A.
Year: 2022
Question 3:
For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), if the concentration of NH3 is increased, the equilibrium will shift in which direction? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Forward direction
B) Backward direction
C) No change
D) Depends on temperature
Solution:
According to Le Chatelier's principle, increasing the concentration of NH3 will shift the equilibrium backward. Correct answer is B.
Year: 2021
Question 4:
Which of the following changes will not affect the position of equilibrium? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Change in concentration
B) Change in pressure
C) Change in temperature
D) Addition of inert gas
Solution:
Adding an inert gas at constant volume does not affect the position of equilibrium. Correct answer is D.
Year: 2020
Question 5:
What is the relationship between Kp and Kc for a reaction? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Kp = Kc(RT)^(Δn)
B) Kp = Kc/(RT)^(Δn)
C) Kp = Kc/(ΔnRT)
D) Kp = Kc(ΔnRT)
Solution:
The relationship is Kp = Kc(RT)^(Δn), where Δn is the change in moles of gas. Correct answer is A.
Year: 2019
Question 6:
In an exothermic reaction, what happens to equilibrium when the temperature is increased? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Equilibrium shifts to the right
B) Equilibrium shifts to the left
C) No effect on equilibrium
D) Equilibrium constant increases
Solution:
Increasing the temperature of an exothermic reaction shifts the equilibrium to the left. Correct answer is B.
Year: 2018
Question 7:
For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), if the volume of the container is decreased, the equilibrium will shift in which direction? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Forward direction
B) Backward direction
C) No change
D) Depends on temperature
Solution:
Decreasing the volume increases pressure, shifting the equilibrium toward the side with fewer moles of gas (SO3). Correct answer is A.
Year: 2022
Question 8:
What is the effect of increasing the concentration of reactants on the equilibrium position? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Shifts to the left
B) Shifts to the right
C) No effect
D) Depends on the reaction
Solution:
Increasing the concentration of reactants will shift the equilibrium to the right. Correct answer is B.
Year: 2021
Question 9:
Which of the following reactions is an example of dynamic equilibrium? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) Ice melting at 0°C
B) Water boiling at 100°C
C) A saturated solution of salt
D) All of the above
Solution:
All of the listed reactions are examples of dynamic equilibrium. Correct answer is D.
Year: 2020
Question 10:
The equilibrium constant for a reaction is K = 4 at 25°C. If the concentration of products is increased, how will K change? This question has been asked thrice- JEE Main 2018, JEE Main 2022, JEE Main 2024
Options:
A) K will increase
B) K will decrease
C) K will remain the same
D) K will become zero
Solution:
The equilibrium constant K is temperature dependent and does not change with the concentration of products. Correct answer is C.
Year: 2019
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