NCERT Chemistry Books For Competitive Exams- Both In English / Hindi: Download Class 11th NCERT Chemistry Chapters: Chemistry Part-I Class 11th: Unit 1: Some Basic Concepts of Chemistry एकक 1: रसायन विज्ञान की वुफछ मूल अवधरणाए Unit 2: Structure of Atom एकक 2: परमाणु की संरचना Unit 3: Classification of Elements and Periodicity in Properties