Arihant's All in One has been a favourite and first choice of teachers as well as students since its first edition. All in One Chemistry has been designed for the students of Class XII. The fully revised 2017-18 edition has been penned down by an experienced examiner providing all explanations and guidance needed for effective study and achieving success in the upcoming CBSE Class XI Chemistry Examination. The present book for Class XI Chemistry has been designed to ensure Complete Study, Complete Practice and Complete Assessment. The whole syllabus for Class XI Chemistry has been divided into14 chapters covering Some Basic Concepts of Chemistry, Structure of Atom, Classification of Elements & Periodicity in Properties, Chemical Bonding & Molecular Structure, States of Matter, Thermodynamics, Equilibrium, Redox Reactions, Hydrogen, The s-Block Elements, The p-Block Elements, Organic Chemistry Some Basic Principles & Techniques, Hydrocarbons and Environmental Chemistry. The book has been designed strictly in sync with the latest CBSE syllabus &Chemistry NCERT Textbook, with each chapter divided into individual topics for better understanding. Each individual topic contains detailed theory in notes form supported by illustrations, tables, flow charts, etc. which will help in effective comprehension of the concepts. Questions given in each chapter have been grouped as Very Short Answer Type, Short Answer Type, Long Answer Type and HOTS. These Topicwise-Chapterwise questions cover NCERT Questions, Previous Years' Examination Questions as well as other important questions from the examination point of view. Solutions and explanations to all the questions have been given to facilitate easy learning and understanding. Chapter Practice, a small test that has been given at the end of each chapter will help students in assessing their level of understanding. For thorough practice and to give students a real feel of the examination 10 Sample Question Papers have been given after the chapterwise study.