1. Pure substances are classified into A Elements and Compounds B. Homogeneous and Heterogeneous C. Pune Substances and Mentres D. Acids and Bases 2. Which of the following has definite properties mad made up of only coe kind of B. Pure Substance C. Colloid D. Suspension 3. M is represented by one or two-letter symbol A Element B. Compound C. Mixtuse D. Acid 4. Which of the following is NOT an element? A. Mg B. Sb C. Pz D. Au 5. Which of the following is an element? A sodium chloride B methane C.mercury D carbon dioxide 6. The following are compounds. EXCEPT A table salt B water Corygen D Sugar 7. The air you breathe is a 99% mixture of A Metals Bnonmetals Cmetalloids D metals and nonmetals 8. Increase in emission of carbon dioxide can lead to global warming Carbon diodde is alan Atlement B compound C mixture D. Base 19. Which of the following describes an element? A. The simplest substance. B. It can be broken down into other types of substances. C. It can be separated through a chemical process. D. It is composed of two or more types of atoms. 10. Salt is made up of what elements? A Sodium and Chloride B. Sodium and Chlorine C. Sodium and Copper D. Sodium and Oxide 11. Which of the following is correctly matched? A Gold: Element: Silver: Compound B. Oxygen: Element: Water: Compound​