ECAT Chemistry — Reaction Kinetics
Reaction Kinetics is part of the Chemistry section of the UET ECAT (30 of the 100 MCQs). It breaks into 2 subtopics, and we hold 27 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (2)
How Reaction Kinetics is tested
Across the 7 ECAT past papers on ParhaiKrlo, Reaction Kinetics accounts for 7 questions. It appears in 4 of them, about 1.8 questions a paper. The heaviest was ECAT Past Paper 05, with 3 questions, and the most recent is ECAT Past Paper 07, with 1.
| Paper | Questions |
|---|---|
| ECAT Past Paper 07 | 1 |
| ECAT Past Paper 05 | 3 |
| ECAT Past Paper 03 | 1 |
| ECAT Past Paper 02 | 2 |
Reaction Kinetics MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 07 · Reaction Kinetics
A catalyst helps in a reaction by:
- A.Increasing the rate of reaction
- B.Lowering the activation energy barrier
- C.Increasing the activation energy barrier
- D.Both options A and B are correct
Show answer
Answer: D. Both options A and B are correct — A catalyst provides a path of lower activation energy, so the rate increases.
- Q2 · ECAT Past Paper 05 · Reaction Kinetics
For the reaction A + B → products, rate = k[A][B]. The overall order of the reaction is:
- A.0
- B.1
- C.2
- D.3
Show answer
Answer: C. 2 — Order = sum of the powers in the rate law = 1 + 1 = 2.
- Q3 · ECAT Past Paper 03 · Reaction Kinetics
Platinum gauze catalyses the oxidation of ammonia to nitric oxide. This is an example of:
- A.Homogeneous catalysis
- B.Heterogeneous catalysis
- C.Both
- D.None
Show answer
Answer: B. Heterogeneous catalysis — Solid Pt with gaseous NH₃ and O₂: catalyst and reactants are in different phases.