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A First Order Reaction is one of the simplest yet most important types of chemical reactions studied in chemical kinetics. In this reaction, the rate depends directly on the concentration of a single reactant. Understanding this concept is essential for solving numericals and predicting reaction behavior.

Key points about First Order Reaction:

Rate law: Rate = k[A]

Reaction rate is proportional to the concentration of one reactant.

Integrated form: ln[A] = ln[A]₀ – kt

Half-life (t½) is independent of initial concentration: t½ = 0.693/k

Graph: A plot of ln[A] vs time gives a straight line.

Common examples: radioactive decay, hydrolysis of esters in acid/base medium.

This video is designed for students preparing for CSS, PMS, and competitive exams, providing a clear and exam-oriented explanation of First Order Reactions.

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