MDCAT Chemistry — Chemical Equilibrium
Chemical Equilibrium is a core Chemistry topic in the PMDC MDCAT syllabus, covering 7 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (7)
- Acids & Bases
- Buffer Solutions
- Common Ion Effect
- Haber's Process
- Ka, pKa and Acid Strength
- Le Chatelier's Principle
- Solubility Products
How Chemical Equilibrium is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Chemical Equilibrium accounts for 60 questions. It appears in all 16, about 3.8 questions a paper. The heaviest was MDCAT 2016, with 6 questions, and the most recent is MDCAT 2025, with 2.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 2 |
| MDCAT 2024 | 4 |
| MDCAT 2023 | 4 |
| MDCAT 2022 | 5 |
| MDCAT 2019 | 3 |
| MDCAT 2018 | 4 |
| MDCAT 2017 | 4 |
| MDCAT 2016 | 6 |
| MDCAT 2015 | 4 |
| MDCAT 2014 | 3 |
| MDCAT 2013 | 5 |
| MDCAT 2012 | 6 |
| MDCAT 2011 | 3 |
| MDCAT 2010 | 3 |
| MDCAT 2009 | 2 |
| MDCAT 2008 | 2 |
Chemical Equilibrium MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Chemical Equilibrium
Which of the following is a basic buffer?
- A.NH₄OH/NH₄Cl
- B.NaOH/NaCl
- C.NaOH/HCl
- D.H₂CO₃/NaHCO₃
Show answer
Answer: A. NH₄OH/NH₄Cl — NH4OH/NH4Cl is a basic buffer.
- Q2 · MDCAT 2024 · Chemical Equilibrium
The principle that states that if a stress is applied to a system at equilibrium the system nullify the effect of stress as far as possible is:
- A.Haber's
- B.Le-Chatelier
- C.Boyle's
- D.Charles'
Show answer
Answer: B. Le-Chatelier — Le Chatelier's principle states a system at equilibrium shifts to counteract (nullify) an applied stress.
- Q3 · MDCAT 2023 · Chemical Equilibrium
What is the ultimate fate of reversible reaction?
- A.Completion of reaction
- B.Complete consumption of reactants
- C.Complete consumption of products
- D.A state when there is no net concentration change
Show answer
Answer: D. A state when there is no net concentration change — A reversible reaction ultimately reaches a state of dynamic equilibrium, where there's no further net change in concentrations.