Thorough and comprehensive knowledge of the concepts is required by the aspirants appearing for popular engineering entrances like JEE Main & Advanced, MHT CET, BITSAT, GUJ-CET, VIT, OJEE, Karnataka CET, WBJEE, etc. And to help aspirants master the concepts of Chemistry, Arihant has come up with the revised edition of Objective Chemistry Volume 1. The present book has been designed in sync with Class XI Chemistry NCERT textbook to help aspirants prepare for the competitions along with their school studies. The book contains more than 5000 objective questions of all types like single option correct, matching, assertion-reason and statement based questions. The book has been divided into 26 chapters namely Some Basic Concepts of Chemistry, Structure of Atom, Classification of Elements & Periodicity in Properties, Chemical Bonding & Molecular Structure, Gaseous State, Liquid State, Laws of Thermodynamics, Thermochemistry, Dynamic Equilibrium, Ionic Equilibrium, Redox Reactions, Hydrogen, s-Block Elements I, s-Block Elements II, p-Block Elements I, p-Block Elements II, Nomenclature of Organic Compounds, Isomerism, Fundamental Concepts in Organic Reactions Mechanism, Purification & Elemental Analysis of Organic Compounds, Alkanes, Alkenes, Alkynes, Aromatic Hydrocarbons, Radioactivity and Environmental Chemistry, each sub-divided into number of topics. The ample number of solved and unsolved questions provided in the book have been designed in such a way that it makes different concepts clear and also their applications for solving different types of problems. The questions provided in the book incorporate the syllabi of almost all engineering entrances in India. Each chapter contains objective questions presented in two levels, Level I covering the basic questions and Level II covering higher difficulty order questions. The questions have been divided into two levels to help aspirants practice the concepts step by step. Each chapter also contains a collection of questions asked in different national and regional medical entrances. The exercises have been solved in detail to help students understand the concepts better and effectively. The book also contains JEE Main & Advanced 2015 Solved Papers to help candidates get an insight into the examination pattern and the types of question asked therein. As the book contains ample number of questions which can be asked in the upcoming engineering entrances as well as questions asked in previous years’ engineering entrance examinations, it for sure will students master the concepts of Chemistry and also the skills required to tackle the questions asked in different formats in entrances.