This text presents a unified treatment of all the classical topics spanning physical chemistry. Using simple language and developing the subject matter in a logical manner, it helps students understand and apply the concepts rather than learn the subject by rote. The book also simplifies some topics, such as quantum mechanics, non-equilibrium thermodynamics, and group theory. Extensive exercises at the end of each chapter test students’ understanding of the concepts and sharpen their problem-solving skills. Interesting facts are highlighted in grey boxes and worked examples complement the text wherever required.