NeetVictoryQuestion 1: Buffer Solutions and Solubility Product
The pH of a buffer made from 0.1 M acetic acid and 0.1 M sodium acetate (pKa = 4.76) is:
- A 9.24
- B 4.76
- C 7
- D 2.88
Answer: B. 4.76
Why: pH = pKa + log([salt]/[acid]) = 4.76 + 0.
NEET Chemistry: Equilibrium. Chapter-wise Practice Questions and Test
Equilibrium is a Class 11 Chemistry chapter that carries about 4.5% of the Chemistry questions in NEET. Practise it with 48 questions covering 4 topics, each with an explanation.
Practise Equilibrium
Open in the appSets of 15 questions that adapt to your level, with an explanation for every answer.
Topics covered in Equilibrium
- Buffer Solutions and Solubility Product (9 questions)
- Ionic Equilibrium and pH (16 questions)
- Law of Chemical Equilibrium and Kc/Kp (14 questions)
- Le Chatelier's Principle (9 questions)
How often Equilibrium has come up in NEET
Across the 13 previous year papers, Equilibrium had 34 questions, about 2.6 a year. The most in one paper was 6, in NEET 2026.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 6 |
| NEET 2025 | 3 |
| NEET 2024 | 3 |
| NEET 2023 | 0 |
| NEET 2022 | 2 |
| NEET 2021 | 1 |
| NEET 2020 | 2 |
| NEET 2019 | 3 |
| NEET 2018 | 3 |
| NEET 2017 | 3 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 3 |
| AIPMT 2014 | 3 |
Sample questions on Equilibrium with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 2: Ionic Equilibrium and pH
The pH of a 0.01 M solution of the strong base NaOH at 25 °C is:
- A 10
- B 12
- C 13
- D 2
Answer: B. 12
Why: [OH⁻] = 0.01 M, so pOH = 2 and pH = 14 − 2 = 12.
Question 3: Law of Chemical Equilibrium and Kc/Kp
For the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g), the expression for Kc is:
- A [SO₃]² / ([SO₂]² [O₂])
- B ([SO₂]² [O₂]) / [SO₃]²
- C [SO₃] / ([SO₂] [O₂])
- D [SO₃]² / ([SO₂] [O₂])
Answer: A. [SO₃]² / ([SO₂]² [O₂])
Why: Each concentration is raised to the power of its stoichiometric coefficient: products over reactants.
Question 4: Le Chatelier's Principle
Removing a product from an equilibrium mixture as it forms:
- A shifts the equilibrium in the forward direction
- B changes K
- C has no effect
- D shifts it backward
Answer: A. shifts the equilibrium in the forward direction
Why: The system acts to replace the product removed.
Question 5: Buffer Solutions and Solubility Product
The solubility of Mg(OH)₂ is 10⁻⁴ mol/L. Its solubility product Ksp is:
- A 4 × 10⁻¹²
- B 10⁻⁸
- C 2 × 10⁻⁸
- D 10⁻¹²
Answer: A. 4 × 10⁻¹²
Why: Ksp = [Mg²⁺][OH⁻]² = s(2s)² = 4s³.
Question 6: Ionic Equilibrium and pH
The successive ionisation constants of a polyprotic acid such as H₃PO₄:
- A are zero
- B are all equal
- C decrease, Ka₁ > Ka₂ > Ka₃
- D increase
Answer: C. decrease, Ka₁ > Ka₂ > Ka₃
Why: It becomes harder to remove a proton from an already negative ion.
Question 7: Law of Chemical Equilibrium and Kc/Kp
For CaCO₃(s) ⇌ CaO(s) + CO₂(g), the equilibrium constant Kp is:
- A equal to p(CO₂)²
- B equal to 1/p(CO₂)
- C equal to the partial pressure of CO₂
- D equal to the mass of CaO
Answer: C. equal to the partial pressure of CO₂
Why: Pure solids do not appear in the expression.
Question 8: Le Chatelier's Principle
In the Haber process for ammonia, the favourable conditions are:
- A low temperature and low pressure
- B low pressure and high temperature
- C high pressure, moderate temperature (about 700 K) and an iron catalyst
- D high temperature and no catalyst
Answer: C. high pressure, moderate temperature (about 700 K) and an iron catalyst
Why: The reaction is exothermic with fewer moles of gas on the right.
Practise all of Equilibrium
Open in the appFrequently asked questions
How many questions come from Equilibrium in NEET?
Equilibrium carries about 4.5% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 34 times, about 2.6 questions a year.
Which class is Equilibrium from?
Equilibrium is a Class 11 Chemistry chapter in the NCERT syllabus.
Where can I practise Equilibrium questions for NEET?
NeetVictory has 48 practice questions on Equilibrium, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.