This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 31 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 31 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A local water quality standard for a particular metal is 100 ppm. Which of the following describes what 100 ppm means? A) 1/1, 000, 000. B) 10/1, 000, 000. C) 100/1, 000, 000. D) 1, 000/1, 000, 000. Show Answer Correct Answer: C) 100/1, 000, 000. 2. Butter bean seeds were placed in dishes lined with moist paper towel for 5 days at different temperatures & germination was measured. Which of the following is the independent variable? A) Number of seeds. B) Time. C) Temperature. D) Type of seed. Show Answer Correct Answer: C) Temperature. 3. Cr + Mn + Ni A) Compound. B) Element. C) Mixture. D) None of above. Show Answer Correct Answer: C) Mixture. 4. Which of the following are the benefits of using catalysts in industrial processes? (1)Needing higher temperatures for reactions(2) Lowering the operating temperature(3) Getting more product in a relatively shorter period oftime A) And (2) only. B) And (3) only. C) And (3) only. D) , (2) and (3). Show Answer Correct Answer: B) And (3) only. 5. In a neutral atom, the atomic number is also equal to which of the following? A) The number of protons. B) The number of electrons. C) The number of protons and neutrons. D) The number of neutrons. E) The number of protons and electrons. Show Answer Correct Answer: E) The number of protons and electrons. 6. Argon (proton number =18) is inert to any chemical reaction because A) It is light. B) It is located in Group 18. C) It has achieved stable duplet electron arrangement. D) It has achieved stable octet electron arrangement. Show Answer Correct Answer: D) It has achieved stable octet electron arrangement. 7. What is the charge of S? A) 0. B) +1. C) -2. D) -1. Show Answer Correct Answer: C) -2. 8. A substance that consists of only one type of atom A) Mixture. B) Element. C) Compound. D) Solute. Show Answer Correct Answer: B) Element. 9. Coordination No. = 6No. of Molecules = 1APF = 0.52Relationship (a to r) = a=2r A) Simple Cubic. B) Body Centered Cubic. C) Face Centered Cubic. D) Hexagonal Closed Pack. Show Answer Correct Answer: A) Simple Cubic. 10. Consider the reaction:2 H2O + energy $\rightarrow$ 2H2 + O2 A) Exothermic because releasing energy. B) Exothermic because absorbing energy. C) Endothermic because absorbing energy. D) Endothermic because releasing energy. Show Answer Correct Answer: C) Endothermic because absorbing energy. 11. An example of a chemical property is ..... A) Flammability. B) Change of State. C) Burning. D) Density. Show Answer Correct Answer: A) Flammability. 12. When bromine water is shaken with a liquid organic compound, it is rapidly decolourized. What can be determined from this test? A) The compound is an alcohol. B) The compound is an alkane. C) The compound is an alkene. D) The compound is an iodoalkane. Show Answer Correct Answer: C) The compound is an alkene. 13. ..... is everything around us. It takes up space and has mass. A) Atom. B) Chemistry. C) Matter. D) Molecules. Show Answer Correct Answer: C) Matter. 14. Biochemistry deals with A) Chemical changes in non living things. B) Physical and chemical changes in humans. C) Physical changes. D) I don't know. Show Answer Correct Answer: B) Physical and chemical changes in humans. 15. Among are the characteristics of Polycrystalline materials except ..... A) Crystallographic orientation varies from grain to grain. B) Composed of a collection of small crystals or grains. C) There exists an atomic mismatch within region of grains. D) Everything in the list are characteristics of Polycrystalline materials. Show Answer Correct Answer: D) Everything in the list are characteristics of Polycrystalline materials. 16. How many atoms is in this formula? Na2 CO3 A) 3. B) 4. C) 5. D) 6. Show Answer Correct Answer: D) 6. 17. What is the name of the compound N2O3? A) Sodium dioxide. B) Dinitrogen trioxide. C) Dinitrogen oxide. D) Nitrous oxide. Show Answer Correct Answer: B) Dinitrogen trioxide. 18. A form of matter that has a definite composition and distinct properties. A) Mixture. B) Element. C) Compound. D) Pure Substance. Show Answer Correct Answer: D) Pure Substance. 19. Wood + oxygen $\rightarrow$ carbon dioxide + water +energy ; what are the products A) Wood and oxygen. B) Carbon dioxide and water. C) Oxygen and energy. D) Wood and energy. Show Answer Correct Answer: B) Carbon dioxide and water. 20. A mixture in which substances are not evenly mixed A) Heterogeneous mixture. B) Physical change. C) Homogeneous mixture. D) Chemical change. Show Answer Correct Answer: A) Heterogeneous mixture. ← PreviousNext →Related QuizzesScience QuizzesChemistry Quiz 1Chemistry Quiz 2Chemistry Quiz 3Chemistry Quiz 4Chemistry Quiz 5Chemistry Quiz 6Chemistry Quiz 7Chemistry Quiz 8Chemistry Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books