In this edition, the features of the previous edition are preserved. The whole of the subject matter has been critically and thoroughly examined. The chapter on the classification of elements and periodicity in properties has been refined in several places and the periodic table updated. Suggestions of respected teachers are incorporated in several places. The latest objective questions asked in entrance examinations have been added with solutions. Objective questions given for practice at the end of each unit are mainly based on the NCERT chemistry book and NCERT exemplar problems. Several new objective questions with solutions have been added in each unit. The complete subject matter has been arranged in a systematic and lucid manner. Every topic has been dealt with precisely and to the point in simple and understandable language. Concepts have been explained with proper reasoning. Each unit is provided with a synopsis, i.e., points to remember which shall help to revise the subject matter quickly before the examination. A number of illustrations of solved objective questions are given within the text for a proper understanding of the subject matter. At the end of each chapter, four sections of objective questions have been given with hints and solutions.