NCERT Exemplar Class 12 Chemistry Chapter 4 - Chemical kinetics - Free PDF Download

The Arrhenius equation and integrated rate laws are the most frequently tested topics in JEE Main from Chemical Kinetics. According to NTA's historical question papers, at least one numerical involving the calculation of activation energy using two temperature-rate constant pairs appears in almost every JEE Main session. Master these two areas first before moving to molecularity and collision theory.

NCERT Exemplar Class 12 Chemistry Chapter 4 contains approximately 55–60 questions in total, spread across MCQs (single correct and multiple correct), Assertion–Reason pairs, short-answer questions, and long-answer questions. Each question type targets a specific cognitive level, ranging from recall (MCQ) to application and analysis (long-answer and data-based questions)

NCERT Exemplar Chapter 4 is sufficient for scoring full marks in the Chemical Kinetics section of the CBSE board exam when combined with the standard NCERT textbook. The Exemplar covers all question formats — MCQ, Assertion–Reason, short answer, and long answer — that CBSE uses. Students who complete both textbook exercises and Exemplar questions rarely find any board questions outside their preparation.

NEET does not include Chemical Kinetics as a core chapter in the Biology-heavy NEET syllabus, but it does appear in NEET Chemistry. The NCERT Exemplar Chapter 4 questions — particularly those on Arrhenius equation, temperature dependence of reaction rate, and catalysis — directly match the NEET question pattern. Completing this Exemplar strengthens both CBSE board performance and NEET Chemistry scores simultaneously.

The half-life of a first-order reaction is t₁/₂ = 0.693/k, where k is the rate constant in s⁻¹. This value is constant — it does not depend on the initial concentration of the reactant. This is a defining characteristic of first-order reactions and is tested in both CBSE board numericals and JEE Main conceptual MCQs. Always state this independence explicitly in board exam answers to secure full marks.

Order of reaction is determined experimentally from the rate law and can be zero, fractional, or any whole number. Molecularity is a theoretical concept based on the number of molecules colliding in a single elementary step — it is always a positive whole number and applies only to elementary reactions. CBSE board papers and NCERT Exemplar both test this distinction through Assertion–Reason and definition-based questions.

Detailed, step-by-step solutions for NCERT Exemplar Class 12 Chemistry Chapter 4 are available through eSaral's app and website. eSaral's solutions are prepared by IIT Bombay faculty — including AIR-2 rank holders — who present solutions in the exact format CBSE awards full marks. Each solution includes the formula, substitution, unit tracking, and the final answer with the correct significant figures.