This quiz works best with JavaScript enabled. Home > Science > Chemistry > Chemistry – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Chemistry Quiz 23 (20 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The most extensive, commercially useful source of thorium as monazite sand occurs in India at A) Orissa coast. B) Gujarat coast. C) West Bengal coast. D) Travancore coast. Show Answer Correct Answer: D) Travancore coast. 2. Four most common elements that make up all living things are carbon, hydrogen, A) Nitrogen, and iron. B) Oxygen, and nitrogen. C) Calcium, and phosphorus. D) Oxygen, and iron. Show Answer Correct Answer: B) Oxygen, and nitrogen. 3. Which of the following is the strongest acid? A) 1. B) 3. C) 9. D) 14. Show Answer Correct Answer: A) 1. 4. What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight? A) SO. B) SO2. C) SO3. D) S6O4. Show Answer Correct Answer: C) SO3. 5. An industrially important element contains 26 electrons and rusts in the presence of air and moisture. Identify the element. A) Aluminum. B) Iron. C) Potassium. D) Sodium. Show Answer Correct Answer: B) Iron. 6. ..... refer to the ingredients or constituents. A) Cost. B) Consumer products. C) Science. D) Composition. Show Answer Correct Answer: D) Composition. 7. Which of the following compounds have the same empirical formula? A) CO2 and SO2. B) C7H14 and C10H20. C) C4H10 and C10H4. D) C6H12 and C6H14. Show Answer Correct Answer: B) C7H14 and C10H20. 8. Which charged particle is positive? A) Electron. B) Proton. C) Neutron. D) None of above. Show Answer Correct Answer: B) Proton. 9. Biogas majorly contains? A) Methane. B) Hydrogen. C) Ethane. D) CO. Show Answer Correct Answer: A) Methane. 10. An atom that has a charge after losing or gaining electrons is called A) Molecule. B) An ion. C) Compound. D) Substance. Show Answer Correct Answer: B) An ion. 11. Which substance would take a long time to cool off? A) Iron. B) Lead. C) Copper. D) Water. Show Answer Correct Answer: D) Water. 12. When acids and bases are added together, they produce A) Salt. B) Water. C) Water and salt. D) Nothing. Show Answer Correct Answer: C) Water and salt. 13. A neutral atom that contains 11 protons, also contains ..... electrons A) 11. B) 12. C) 5. D) 6. Show Answer Correct Answer: A) 11. 14. A(n) ..... is an ion with a positive (+) charge. A) Anion. B) Cation. C) Ion. D) Solute. Show Answer Correct Answer: B) Cation. 15. Protons are the determination for the ..... A) Groups. B) More protons. C) Element. D) Electron rings. Show Answer Correct Answer: C) Element. 16. The chemical used as a fixer in photography is? A) Borax. B) Sodium sulphate. C) Ammonium sulphate. D) Sodium thiosulphate. Show Answer Correct Answer: D) Sodium thiosulphate. 17. The atomic number is the number of ..... in the nucleus. A) Protons. B) Protons & neutrons. C) Protons, neutrons, & electrons. D) Electrons. Show Answer Correct Answer: A) Protons. 18. It is the temperature at which the vapor pressure is equal to the external or atmospheric pressure. A) Viscosity. B) Surface tension. C) Boiling point. D) Vapor pressure. Show Answer Correct Answer: C) Boiling point. 19. Water climbing from the roots to the top of a plant through small tubes. The water sticks to itself (cohesion) and to the side of the tube (adhesion). A) Capillary Action. B) High Heat of Vaporization. C) High Specific Heat. D) Hydrophobic. Show Answer Correct Answer: A) Capillary Action. 20. Deoxyribonucleic acid is also known as A) RNA. B) ATP. C) DNA. D) NaCl. Show Answer Correct Answer: C) DNA. ← 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