MDCAT Chemistry — Reaction Kinetics
Reaction Kinetics is a core Chemistry topic in the PMDC MDCAT syllabus, covering 5 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (5)
- Activation Energy and Activated Complex
- Factors Affecting Rate of Reaction
- Order of Reaction
- Rate Constant
- Rate of Reaction and Rate Equation
How Reaction Kinetics is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Reaction Kinetics accounts for 34 questions. It appears in 15 of them, about 2.3 questions a paper. The heaviest was MDCAT 2017, with 4 questions, and the most recent is MDCAT 2025, with 3.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 3 |
| MDCAT 2024 | 3 |
| MDCAT 2023 | 2 |
| MDCAT 2022 | 2 |
| MDCAT 2019 | 3 |
| MDCAT 2018 | 3 |
| MDCAT 2017 | 4 |
| MDCAT 2016 | 2 |
| MDCAT 2015 | 1 |
| MDCAT 2014 | 1 |
| MDCAT 2013 | 3 |
| MDCAT 2012 | 3 |
| MDCAT 2011 | 2 |
| MDCAT 2010 | 1 |
| MDCAT 2009 | 1 |
Reaction Kinetics MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Reaction Kinetics
The amount of energy needed to weaken existing bonds to an extent that can be broken through collision is called:
- A.Bond energy
- B.Activation energy
- C.Average energy
- D.Enthalpy
Show answer
Answer: B. Activation energy — Activation energy is the energy needed to weaken bonds enough for a successful, bond-breaking collision.
- Q2 · MDCAT 2024 · Reaction Kinetics
Identify the correct formula to calculate rate of reaction:
- A.Change in concentration of substance / Time taken for the change
- B.Time taken for the change / Change in concentration of substance
- C.Time taken for the change / Change in concentration x 100
- D.Time taken for the change x Change in concentration of substance
Show answer
Answer: A. Change in concentration of substance / Time taken for the change — Rate of reaction = change in concentration of a substance divided by time taken.
- Q3 · MDCAT 2023 · Reaction Kinetics
The rate of reaction between two specific time intervals is called:
- A.Instantaneous rate of reaction
- B.Rate of reaction
- C.Average rate of reaction
- D.Initial rate
Show answer
Answer: C. Average rate of reaction — The rate of reaction calculated over a specific time interval (rather than at a single instant) is called the average rate of reaction.