Chemistry is the study of composition, properties and interaction of matter. Chemistry interlinks other branches of science. Principles of chemistry are applied widely. There are some basic concepts which help us to understand chemistry better. These are state of a matter, nature, physical and chemical properties, moles and molar mass, composition and various basic laws like Avogadro’s law, Dalton’s theory, etc. Below listed are some questions related to basic concepts of chemistry important for NEET.