🧪 JEE Main Chemistry — Chemical Kinetics

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📄 PYQs

Previous year questions for Chemical Kinetics with detailed solutions

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📝 Mock Test

Chapter mock test for Chemical Kinetics based on latest NTA pattern

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📚 Notes

Concise notes with all important formulas and concepts for Chemical Kinetics

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🔥 Top Repeated Questions

Most frequently asked Chemical Kinetics questions across all JEE Main sessions

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Chemical Kinetics — Overview for JEE Main

Chemical Kinetics is an important chapter in JEE Main Chemistry. Every mark matters for your JEE Main rank.

This page provides PYQs with solutions, chapter mock tests, concise formula notes, and the most frequently repeated questions from Chemical Kinetics across all JEE Main sessions.

Key Topics in Chemical Kinetics

Rate of reaction
Order & molecularity
Arrhenius equation
Half-life
Integrated rate laws

How to Prepare Chemical Kinetics for JEE Main

Step 1 — NCERT First: Read the NCERT chapter completely. Understand every concept and formula derivation before moving to reference books.

Step 2 — Practice Book: For Physical Chemistry chapters, solve numericals from Narendra Awasthi or OP Tandon. For Organic, study mechanisms from MS Chauhan. For Inorganic, NCERT reading with JD Lee supplementation is sufficient.

Step 3 — PYQ Practice: Use the PYQ link above to practice all previous year questions for Chemical Kinetics. Identify the most common question types and master them.

Step 4 — Timed Mock Test: Take the mock test above under exam conditions. Target under 2 minutes per question. Analyse every mistake immediately.

Frequently Asked Questions

What is the difference between order and molecularity? +

Molecularity is the number of molecules colliding in the rate-determining elementary step — always a whole number (1, 2, or 3), theoretical concept. Order is the experimentally determined power of concentration in the rate law — can be fractional, zero, or negative. For an elementary reaction, order = molecularity. For complex reactions, order must be determined experimentally.

What are the integrated rate laws for JEE Main? +

Zero order: [A] = [A]₀ - kt, t½ = [A]₀/2k. First order: ln[A] = ln[A]₀ - kt, t½ = 0.693/k (independent of concentration). Second order: 1/[A] = 1/[A]₀ + kt, t½ = 1/(k[A]₀). JEE Main most frequently tests first-order reactions — recognise them from constant half-life or from ln[A] vs t giving a straight line.

What is the Arrhenius equation? +

k = Ae^(-Ea/RT) where A is pre-exponential factor (frequency factor), Ea is activation energy, R = 8.314 J/mol·K, T is temperature in Kelvin. Taking log: lnk = lnA - Ea/RT. For two temperatures: ln(k₂/k₁) = (Ea/R)(1/T₁ - 1/T₂). JEE Main tests: finding Ea from rate constants at two temperatures, effect of temperature on rate, and catalyst effect (lowers Ea, increases k).

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