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JEE Advanced Equilibrium Important Questions

Last updated date: 28th May 2024
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JEE Advanced Important Questions of Equilibrium

The Joint Entrance Examination is held annually by one of the 7 IIT’s under the supervision of joint admission board, JAB. It is used to assess students on several subjects and the knowledge that they've acquired, and this exam is the only  prerequisite to get into any of the IIT colleges. JEE Advanced has an eligibility criterion which students must satisfy to appear for the same. Candidates should rank amongst the top scorers in the IIT JEE main paper and satisfy the marks criteria broken down for the paper to appear for the JEE advanced exam. The Jay East advanced exam is considered to be one of the toughest exams. A few tips to make sure you were fully prepared on your journey of the advanced exam are :

  • Solve as many mock papers as you can.

  • Following your own method of study.

  • Managing time efficiently. Making sure you don't miss out on any questions. 

  • Having an organized and attainable timetable and making realistic goals.


JEE Advanced Important Questions


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Chapter-wise Important Questions with PDF

Topics of Equilibrium

1. Law of Mass Action:

In JEE Advanced Chemistry's "Chemical Equilibrium," you'll explore the law of mass action, understanding the role of concentrations in chemical reactions. Discover the significance of $(K_c)$ and $(K_p)$ – equilibrium constants that show how reactions balance. (Q), the reaction quotient, helps predict whether a system is at equilibrium. This chapter unveils the secrets of chemical balance in a way that's approachable and relevant for competitive exams.

2. Le Chatelier's Principle 

In JEE Advanced Chemistry's "Chemical Equilibrium," Le Chatelier's Principle is your guide. It explains how a system at equilibrium responds to changes in concentration, temperature, and pressure. Imagine it like a balancing act – if you tip the scales by adjusting these factors, the system adjusts itself to restore balance. It's a key concept in understanding how reactions behave and a crucial topic for excelling in your JEE Advanced studies.

3. Solubility Product and its Applications:

The solubility product tells you how much of a solid can dissolve in a liquid. This concept is crucial for understanding the equilibrium in solutions, and in JEE Advanced, it's like unlocking the secrets behind dissolving substances and predicting their behaviour.

4. Common Ion Effect:

The common ion effect is your backstage pass to understanding how ions impact solubility. Imagine a crowded concert – when a familiar face (common ion) joins, it affects the equilibrium, making some ions less likely to join the "musical" solution. It's a vital concept for predicting how substances interact in solutions, and mastering it in JEE Advanced gives you an edge in unraveling the complexities of chemical equilibrium.

5. PH and Buffer Solutions and Hydrolysis of Salts:

Picture pH as the 'mood' of a solution, indicating whether it's acidic or basic. Acids and bases, according to Bronsted and Lewis, are the key players in this chemical performance. And when salts undergo hydrolysis, it's like observing how substances react with water. Understanding these concepts not only unlocks the language of chemical equilibrium but also lays the foundation for mastering advanced chemistry in JEE.

Important Formulas of Chemical Equilibrium

1. Law of Chemical Equilibrium:

  • $aA+bB\rightleftharpoons cC + dD$

  • $Rate forward\propto [A]^{a} [B]^{b}$

  • $Rate reverse \propto [C]^{c} [D]^{d}$

  • At equilibrium: Rate forward = Rate reverse

2. Equilibrium Constant (K):

  • $K_{c} = \frac{[C]^{c} [D]^{d}}{[A]^{a} [B]^{b}}$

  • Equilibrium constant in terms of partial pressure: $K_{p} = K_{c}(RT)^{\Delta n}$

Where R is the universal gas constant, T is the temperature in Kelvin, and $\Delta$ n is the change in moles of gaseous reactants and products)

3. Reaction Quotient (Q):

  • $Q_{c} = \frac{[C]^{c} [D]^{d}}{[A]^{a} [B]^{b}}$ (in terms of concentration)

  • $Q_{p} = \frac{P_{C}^{c}P_{D}^{d}}{P_{A}^{a}P_{B}^{b}}$ (in terms of partial pressure)

4. Gibbs Free Energy (\Delta G):

  • $\Delta G = \Delta H - T\Delta S$

  • $\Delta G^{\circ} =$ RTln(K)(at equilibrium, Q = K)

5. Ionic Product of Water (Kw):

  • $K_{w} = [H^{+}] [OH^{-}]$

  • At $25^{\circ}C, Kw = 1.0 \times 10^{-14} mol^{2}/L^{2}$

6. Weak Acid and Base Ionization (Ka) (Kb):

  • $K_{a} = \frac{[H^{+}] [A^{-}]}{[HA]}$ (for a weak acid)

  • $Kb = \frac{[OH^{-}] [B^{+}]}{[BOH]}$ (for weak base)

  • $K_{w} = K_{a} \times K_{b}$ (for a weak acid and its conjugate base or a weak base and its conjugate acid)

7. Thermodynamics of Equilibrium:

  • $\Delta G = \Delta H - T\Delta S$

8. Salt Hydrolysis (Kh):

  • $Kh = \frac{[H^{+}][A^{-}]}{[HA]}$ (for a salt of a weak acid and strong base)

  • $Kh = \frac{[OH^{-}][B^{+}]}{[BOH]}$ (for a salt of a strong acid and weak base)

Ace Your JEE Advanced Chemistry Equilibrium Exam with Our Practice Papers

Our JEE Advanced Chemistry Equilibrium practice paper are designed to help you score high in the exam. With targeted questions and in-depth solutions, these papers will boost your preparation and help you secure a top score. Download the PDFs from Chemistry Equilibrium practice papers.

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Competitive Exams after 12th Science

JEE Advanced Important Questions on Equilibrium

All the Important Questions on Equilibrium JEE Advanced are provided here, by Vedantu to help you excel in your exams. These questions are made after a detailed analysis of the entire syllabus. As the JEE Advanced is one of the toughest exams in the country, it is expected from you to know every inch of the syllabus without fail. The JEE Advanced important questions ensure to do the same. Scroll down to download the JEE Advanced Equilibrium Important Questions available as free PDF downloads to enhance your study process.

The chapter on equilibrium expects you to have a strong understanding of the fundamental concepts. Without them, the concepts in this chapter as well look foreign to you. This is a chapter that expects you to learn the theory and apply the same in the real-time equation. The chapter has various important concepts, formulas and laws that need to be studied by the students in order to score and perform well in the exams.

  • Dynamic equilibrium

  • Law  of mass

  • Rate of the forward reaction

  • Rate of backward reaction

  • The equilibrium constant

  • Le Chatelier’s principle

  • Properties of acid

  • Properties of base

  • Properties of salt

  • Ph of acid

  • Ph of base

Important Questions JEE Advanced Equilibrium

The most important part of taking up any exam is to be in a competitive spirit. It is important to have the right winning attitude to be confident in the exam score well. Solving the Important Questions JEE Advanced Equilibrium will help you to understand the paper pattern and various short cut techniques to solve all kinds of complicated exams. Repeated practice with these important questions will guarantee a high score in the exam without a doubt.


JEE Advanced Chemistry's Equilibrium chapter is pivotal for success. The exam's rigour demands a strategic approach, emphasizing mock papers, personalized study methods, and efficient time management. The highlighted topics, including the law of mass action, Le Chatelier's principle, and solubility product, are critical for understanding chemical equilibrium intricacies. The provided formulas are invaluable tools to navigate the complexities of equilibrium reactions. Vedantu's practice papers and important questions serve as potent resources, enhancing exam readiness. As you delve into dynamic equilibrium, laws, and properties.

FAQs on JEE Advanced Equilibrium Important Questions

1. Why should students refer to JEE Advanced Equilibrium Important Questions provided by Vedantu?

Students should refer to JEE Advanced Equilibrium Important Questions by Vedantu because they have been curated and prepared by a team of experts in the particular field. These questions are gathered after thorough research about the previous year question papers which helps the students to analyse the question pattern easily. Vedantu provides all this material for free for the convenience of students. They can download these in a PDF format and use as per their convenience. Students can download it by visiting JEE Advanced Equilibrium Important Questions.

2. What is the difference between dynamic equilibrium and static equilibrium?

Dynamic Equilibrium

Static Equilibrium

1. During dynamic equilibrium the changes occur within the mixture, keeping the total composition the same. 

1. During static equilibrium the particles are at rest, there is no motion between reactants and products. 

2. In dynamic equilibrium the forward and backward reaction rate is equal.

2. In static equilibrium both forward and backward reactions come to a halt.

3. Dynamic equilibrium only occurs in closed systems.

3. Static equilibrium can occur in open as well as closed systems. 

4. Equilibrium is reversible in nature.

4. Equilibrium is irreversible in nature. 

3. State the law of mass and list some of its applications.

The law of mass action explains the behaviour exhibited by the participants in the dynamic equilibrium. It states that the rate of reaction is proportional to the product of the concentration of each reactant. In simple words it suggests that the ratio of the reactant concentration and the product concentration is constant at a state of chemical equilibrium. 

Some Fields in Which this Law is Widely Used:

  1. The law of mass is used in mathematical epidemiology.

  2. It is used in the fields of social physics that is social physics.

  3. Lastly it is also used in mathematical ecology.

4. What are some properties of acids?

An acid is a chemical compound which is any hydrogen containing substance that is capable of donating a proton to another substance. Acidic substances are usually identified by the sour taste. Acids are specifically well known to turn blue litmus red. 

Some Properties of Acids are Listed Below:

  1. Acids are sour in taste.

  2. Acids change the colour of some acid based indicates.

  3. Aqueous solutions of acids are electrolyte which means that they can conduct electrical current.

  4. Acids react with bases to produce a salt compound along with water.

  5. Acids when they react with active metals result in hydrogen gas. 

5. What are bases, mention the properties of bases?

Bases are predominantly characterized by the bitter taste and a slippery texture. A base in simple terms is a molecule or an iron able to accept hydrogen ions from an acid. Bases are particularly known to turn red litmus blue. Acids and bases interact with each other resulting in the formation of salt and water. 

Properties of Bases are:

  1. Bases have a soapy slippery texture.

  2. In their aqueous solutions, bases act as good conductors of electricity. 

  3. Bases have a pH value greater than 7.

  4. Bases release hydrogen ions when dissolved in water.

  5. Bases are bitter.