This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 4 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. CO is symbol of which element? A) Copper. B) CO is a compound. C) Cobalt. D) Chromium. Show Answer Correct Answer: B) CO is a compound. 2. Atomic mass of Chlorine is ..... (u) A) 34. B) 34.5. C) 35.5. D) 35. Show Answer Correct Answer: C) 35.5. 3. According to Law of conservation of mass, mass can be created and destroyed in a chemical reaction A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 4. 1m = ..... nm A) $10^9$. B) $10^{-9}$. C) 10. D) 9. Show Answer Correct Answer: A) $10^9$. 5. Methane is a compound of exactly one carbon atom and four hydrogen atoms. Which of the following is true about methane? A) It will have the same properties as hydrogen. B) It will have the same properties as carbon. C) It will have the properties of both hydrogen and carbon. D) It will have its own unique properties. Show Answer Correct Answer: D) It will have its own unique properties. 6. What is the chemical name of MgCl2? A) Magnesium Chloride 2. B) Magnesium Chloride. C) Magnesium (II) Chloride. D) Magnesium Dichloride. Show Answer Correct Answer: B) Magnesium Chloride. 7. Which of the following is not a polyatomic ion? A) Sulphide. B) Sulphite. C) Sulphate. D) Bisulphide. Show Answer Correct Answer: A) Sulphide. 8. To create a chemical formal you need to know A) The atomic mass of an element. B) The mass of an element. C) Valency of an element. D) All of these. Show Answer Correct Answer: C) Valency of an element. 9. The group of two or more elements is called ..... A) Atom. B) Molecule. C) Complex. D) None of the above. Show Answer Correct Answer: B) Molecule. 10. Who proposed the atomic theory? A) J.J. Thomson. B) John Dalton. C) Ernest Rutherford. D) Niels Bohr. Show Answer Correct Answer: B) John Dalton. 11. What are the building blocks of matter? A) Atoms. B) Protons. C) Cells. D) Neutrons. Show Answer Correct Answer: A) Atoms. 12. The mass of ..... is equivalent to one more atomic mass unit A) 1/12 Sodium Atom. B) 1 Carbon Atom. C) 1/12 Carbon Atom. D) 1/12 Hydrogen Atom. Show Answer Correct Answer: C) 1/12 Carbon Atom. 13. What element is in every living organism? A) Lead. B) Helium. C) Carbon. D) Gold. Show Answer Correct Answer: C) Carbon. 14. What is the mass of a proton and a neutron? A) 1amu. B) 2grams. C) 13 Amo. D) 10cm. Show Answer Correct Answer: A) 1amu. 15. A chemical equation is balanced in accordance with A) Law of conservation of mass. B) Law of Define Proportions. C) Both of the above. D) None of the above. Show Answer Correct Answer: A) Law of conservation of mass. 16. In covalent bonding, valence electrons are ..... A) Shared. B) Transferd. C) Destroyed. D) None of the above. Show Answer Correct Answer: A) Shared. 17. The Chemical formula of Ammonium Chloride is A) NH$_{4}$Cl$_{2}$. B) (NH$_{4}$)Cl. C) (NH$_{4}$)$_{2}$Cl$_{2}$. D) NH$_{4}$Cl. Show Answer Correct Answer: D) NH$_{4}$Cl. 18. When does ionic bonding happen? A) Between 2 metal atoms. B) Between 2 non-metal atoms. C) Between metal and a non-metal atoms. D) Between two transition metals. Show Answer Correct Answer: C) Between metal and a non-metal atoms. 19. Symbol of Copper? A) C. B) CO. C) Cu. D) CU. Show Answer Correct Answer: C) Cu. 20. A sample of NH$_{3 }$molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports: A) Law of Conservation of Mass. B) Las of Multiple Proportions. C) Law of Definite Proportions. D) Avogadros Law. Show Answer Correct Answer: C) Law of Definite Proportions. 21. What is the symbol of silicon A) S. B) And. C) SL. D) Sc. Show Answer Correct Answer: B) And. 22. What is the unit used to measure weighted average atomic mass? A) Amu. B) Gram. C) Angstrom. D) Nanogrm. Show Answer Correct Answer: A) Amu. 23. Which of the following is not a postulate of Dalton's Atomic Theory? A) All matter consists of indivisible particles called atoms. B) Atoms cannot be created or destroyed. C) Atoms of the same element are similar in shape and mass, but differ from the atoms of other elements. D) The electron is the smallest unit of matter that can take part in a chemical reaction. Show Answer Correct Answer: D) The electron is the smallest unit of matter that can take part in a chemical reaction. 24. If atomic mass of Chlorine is 36. Find the number of neutrons? A) 17. B) 18. C) 19. D) 20. Show Answer Correct Answer: C) 19. 25. The smallest unit of an element that retains the properties of that element is called A) A Molecule. B) An atom. C) A proton. D) A neutron. Show Answer Correct Answer: B) An atom. ← PreviousNext →Related QuizzesClass 9 Science Chapter 3 Atoms And Molecules Quiz 1Class 9 Science Chapter 3 Atoms And Molecules Quiz 2Class 9 Science Chapter 3 Atoms And Molecules Quiz 3Class 9 Science Chapter 3 Atoms And Molecules Quiz 5Class 9 Science Chapter 3 Atoms And Molecules Quiz 6Class 9 Science Chapter 3 Atoms And Molecules Quiz 7Class 9 Science Chapter 3 Atoms And Molecules Quiz 8Class 9 Science Chapter 3 Atoms And Molecules Quiz 9Class 9 Science Chapter 3 Atoms And Molecules Quiz 10Class 9 Science Chapter 3 Atoms And Molecules Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books