COMSATS Chemistry — Reaction Kinetics
Reaction Kinetics is part of the Chemistry section of the NTS NAT-IE test COMSATS admits on (10 of the 90 MCQs). It breaks into 1 subtopic, and we hold 19 NAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How Reaction Kinetics is tested
Across the 7 NAT-pattern papers on ParhaiKrlo, Reaction Kinetics accounts for 4 questions. It appears in 4 of them, about 1 questions a paper. The heaviest was COMSATS Past Paper 06, with 1 question.
| Paper | Questions |
|---|---|
| COMSATS Past Paper 06 | 1 |
| COMSATS Past Paper 05 | 1 |
| COMSATS Past Paper 03 | 1 |
| COMSATS Past Paper 01 | 1 |
Reaction Kinetics MCQs from the NAT-pattern papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · COMSATS Past Paper 06 · Reaction Kinetics
Which change increases the rate of a reaction mainly by giving more particles energy above the activation energy?
- A.using larger lumps of solid
- B.raising the temperature
- C.cooling the mixture
- D.lowering the concentration
Show answer
Answer: B. raising the temperature — Higher temperature gives more particles energy ≥ Eₐ.
- Q2 · COMSATS Past Paper 05 · Reaction Kinetics
The usual units for the rate of a chemical reaction are:
- A.dm³ mol⁻¹
- B.mol dm⁻³ s⁻¹
- C.mol dm⁻³
- D.s⁻¹
Show answer
Answer: B. mol dm⁻³ s⁻¹ — Rate = change in concentration per unit time: mol dm⁻³ per second.
- Q3 · COMSATS Past Paper 03 · Reaction Kinetics
Increasing the concentration of reactants increases the rate of reaction mainly because:
- A.the activation energy decreases
- B.collisions between reacting particles become more frequent
- C.the products become more stable
- D.the enthalpy change becomes larger
Show answer
Answer: B. collisions between reacting particles become more frequent — More particles in the same volume collide more often, so more successful collisions occur per second.