Class 12 Chemistry — Chapter 3: Chemical Kinetics
96 practice questions · 32 Easy · 32 Medium · 32 Hard
Practise Class 12 Chemistry Chapter 3, "Chemical Kinetics", with 96 NCERT-aligned multiple-choice questions. The set is split into 32 Easy, 32 Medium and 32 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Chemical Kinetics" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Chemical Kinetics, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 96.
Key concepts: Chemical Kinetics (Class 12 Chemistry)
This chapter covers the rate of reaction, rate laws and order, integrated rate equations, half-life, and the effect of temperature via the Arrhenius equation.
- Rate of reaction
- The change in concentration of a reactant or product per unit time; depends on concentration, temperature and catalyst.
- Rate law & order
- Rate = k[A]^x[B]^y; the order is the sum of the powers, determined experimentally (not from stoichiometry).
- Molecularity vs order
- Molecularity is the number of species in an elementary step (whole number); order can be fractional or zero.
- Integrated rate laws
- Zero order: [A] = [A]₀ − kt; first order: k = (2.303/t) log([A]₀/[A]). First-order half-life is constant.
- Arrhenius equation
- k = Ae^(−Ea/RT); rate rises with temperature because more molecules cross the activation-energy barrier.
Key formulas — Chemical Kinetics
💡 Exam tips for Chemical Kinetics
- Order is found experimentally — never read it off the balanced equation.
- For a first-order reaction, half-life is independent of the initial concentration.
Sample questions
Rate of reaction is:
−d[R]/dt or d[P]/dt.
Half-life of first-order reaction:
Constant t½.
For zero-order reaction, rate is:
Rate = k.
Chemical Kinetics — FAQs
What are the key concepts in Class 12 Chemistry Chemical Kinetics?+
This chapter covers the rate of reaction, rate laws and order, integrated rate equations, half-life, and the effect of temperature via the Arrhenius equation. Key ideas include Rate of reaction, Rate law & order, Molecularity vs order, Integrated rate laws, Arrhenius equation.
What does Class 12 Chemistry Chapter 3 (Chemical Kinetics) cover on XamBaaz?+
It covers 96 NCERT-aligned MCQs on "Chemical Kinetics" — 32 Easy, 32 Medium and 32 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Chemical Kinetics" questions free to practise?+
Yes — sign in with Google to practise "Chemical Kinetics" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Chemical Kinetics" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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