This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The ratio of atomic mass between Hydrogen and Oxygen in Water molecule is? A) 2:10. B) 1:8. C) 8:1. D) 10:16. Show Answer Correct Answer: B) 1:8. 2. The atomicity of Magnesium molecule is A) 1. B) 0. C) 2. D) 3. Show Answer Correct Answer: A) 1. 3. The atomicity of rhombic sulfur is A) 1. B) 2. C) 4. D) 8. Show Answer Correct Answer: D) 8. 4. What is the smallest unit of an element that retains its chemical properties? A) Molecule. B) Compound. C) Atom. D) Ion. Show Answer Correct Answer: C) Atom. 5. Q3) The number of atoms present in one molecule of an element is called as: A) Molecules. B) Compound. C) Empirical formula. D) Atomicity. Show Answer Correct Answer: D) Atomicity. 6. The Latin name of water is ..... A) Oxy. B) Hello. C) Hydro. D) None of the above. Show Answer Correct Answer: C) Hydro. 7. Valency of helium is A) 0. B) 3. C) 2. D) 1. Show Answer Correct Answer: A) 0. 8. The symbol of chlorine is A) CL. B) CL. C) Cl. D) Chl. Show Answer Correct Answer: C) Cl. 9. In a chemical reaction, what is the role of a catalyst? A) It increases the rate of reaction without being consumed. B) It decreases the rate of reaction. C) It is consumed in the reaction. D) It changes the products of the reaction. Show Answer Correct Answer: A) It increases the rate of reaction without being consumed. 10. Who proposed Law of constant proportion? A) John Dalton. B) Joseph L Proust. C) Lavoisier. D) Neil's Bohr. Show Answer Correct Answer: B) Joseph L Proust. 11. Number of protons, electrons and neutrons in Oygen? A) 8 6 6. B) 8 8 6. C) 6 8 8. D) 8 8 8. Show Answer Correct Answer: D) 8 8 8. 12. Which concept is defined as the number of atoms in one mole of a substance? A) Mole. B) Atomic Mass. C) Avogadro's Number. D) Molecular Mass. Show Answer Correct Answer: C) Avogadro's Number. 13. What does the empirical formula represent? A) Actual number of atoms in a molecule. B) Simplest whole-number ratio of atoms in a compound. C) Total number of atoms in a molecule. D) Number of molecules in a compound. Show Answer Correct Answer: B) Simplest whole-number ratio of atoms in a compound. 14. ) Valency of Ferric is A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: D) 3. 15. An atom that has a charge is called ..... A) A proton. B) A neutron. C) An ion. D) An element. Show Answer Correct Answer: C) An ion. 16. Q5) Which one of the following is modern symbol of Gold? A) A) by. B) B) at. C) Q) Al. D) D) ai. Show Answer Correct Answer: B) B) at. 17. Which of the following isthe correct relationship between number of moles, number of particles and avagadros number A) Number of moles= number of particles / avagadros number. B) Number of moles= number of particles x avagadros number. C) Number of moles= number of particles x 1/avagadros number. D) Number of moles= avagadros number / number of particles. Show Answer Correct Answer: A) Number of moles= number of particles / avagadros number. 18. What is the location of intercalary meristem? A) At growing tips of stem or roots. B) On the lateral side of plant organ. C) Inside the Trachea. D) At the base of the leaves. Show Answer Correct Answer: D) At the base of the leaves. 19. "n" and "m" in a numerical indicates A) Number of moles and Molar mass. B) Number of moles and given mass. C) Mass and number of moles. D) None of the above. Show Answer Correct Answer: B) Number of moles and given mass. 20. In Dalton's Atomic Theory, all elements consist of ..... that cannot be divided. A) Atoms. B) Parts. C) Molecules. D) Hydrogen. Show Answer Correct Answer: A) Atoms. 21. Mass of 0.5 mole of CO2 is A) 44gm. B) Dawn. C) 22 gm. D) 55gm. Show Answer Correct Answer: C) 22 gm. 22. Which of the following represents the correct chemical formulae? A) Cock. B) $B IPO_4$. C) Nax. D) NaS. Show Answer Correct Answer: B) $B IPO_4$. 23. The formula of baking powder A) NaHCO3. B) $ _ {NA2 CO3} $. C) Diversity. D) Na2so4. Show Answer Correct Answer: A) NaHCO3. 24. Pencil lead is made of ..... A) Hydrogen. B) Carbon. C) Oxygen. D) Iron. Show Answer Correct Answer: B) Carbon. 25. Where are electrons found? A) The nucleus. B) Next to the neutrons. C) The proton. D) Orbiting the nucleus. Show Answer Correct Answer: D) Orbiting the nucleus. ← PreviousNext →Related QuizzesClass 9 Science Chapter 3 Atoms And Molecules Quiz 1Class 9 Science Chapter 3 Atoms And Molecules Quiz 3Class 9 Science Chapter 3 Atoms And Molecules Quiz 4Class 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