This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How many atoms are there is Na2CO3 A) 4. B) 5. C) 7. D) 6. Show Answer Correct Answer: D) 6. 2. According to Daltons's Atomic theory, "The relative number and kinds of atoms are constant in a given compound." postulate describes A) Law of Conservation of Mass. B) Law of Constant Proportion. C) All the above. D) None of the above. Show Answer Correct Answer: B) Law of Constant Proportion. 3. Atom is from a Greek word 'atomos' that means A) Energy. B) Incapable of being cut. C) Matter. D) Building block. Show Answer Correct Answer: B) Incapable of being cut. 4. If a reaction starts with a total 75g of reactants it should produce A) A total of 40g of products. B) A total of 75g of products. C) A total of 180 g of products. D) None of the above. Show Answer Correct Answer: B) A total of 75g of products. 5. Atomic Mass of H, C, O *Choose the correct option in order A) (16, 12, 0)u. B) (1, 12, 16)u. C) (1, 1, 100)amu. D) X g. Show Answer Correct Answer: B) (1, 12, 16)u. 6. The Latin name of gold A) Auram. B) Sodium. C) Potassium. D) None. Show Answer Correct Answer: A) Auram. 7. In which forms do atoms exist A) Ions. B) Molecules. C) Free electrons. D) Both A and B. Show Answer Correct Answer: D) Both A and B. 8. Who gave the law of chemical reaction ..... A) Joseph proust. B) Antoine Lavoisier. C) Both a and b. D) None of the above. Show Answer Correct Answer: C) Both a and b. 9. Which one of these is the correct symbol for mercury A) Me. B) Me. C) Hg. D) HG. Show Answer Correct Answer: C) Hg. 10. Atomicity is ..... A) The number of atoms present in an element. B) The number of atoms present in a molecule. C) Atomic mass. D) None of the above. Show Answer Correct Answer: B) The number of atoms present in a molecule. 11. What is the chemical symbol for the element mercury? A) Hg. B) Merc. C) MeC. D) MY. Show Answer Correct Answer: A) Hg. 12. Anything that has mass & takes up space A) Gravity. B) Force. C) Matter. D) Volume. Show Answer Correct Answer: C) Matter. 13. Who laid the foundation of laws of chemical combination? A) Democritus and Leupipus. B) Antoine L. Lavoisier. C) John Dalton. D) None of the above. Show Answer Correct Answer: B) Antoine L. Lavoisier. 14. Approximately how many atoms can you fit on the head of a pin? A) 1, 000, 000. B) 1, 000. C) 100. D) 1, 000, 000, 000. Show Answer Correct Answer: D) 1, 000, 000, 000. 15. Atoms of the same element which have a different number of neutrons are called ..... A) Ions. B) Isotopes. C) Quarks. D) Molecules. Show Answer Correct Answer: B) Isotopes. 16. Name two scientist who established the laws of chemical combination A) Antoine L LAVOISER AND JOSEPH L PROUST. B) Anthony Lavoiser and Joseph Proust. C) Anthony L Proust and Joseph L LAVOISER. D) Mr.Hooke and Isaac Newton. Show Answer Correct Answer: A) Antoine L LAVOISER AND JOSEPH L PROUST. 17. The volume of atom is about ..... times the volume of nucleus A) 10$^{5}$. B) 10$^{10}$. C) 10$^{15}$. D) 10$^{20}$. Show Answer Correct Answer: C) 10$^{15}$. 18. What charge does an atom have when it GAINS electrons? A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Negative. 19. All matter is made of what A) Energy. B) Atoms. C) Electrons. D) Compounds. Show Answer Correct Answer: B) Atoms. 20. What is the molecular mass of $HNO_3$ A) 61 u. B) Grate. C) Stab. D) Struggle. Show Answer Correct Answer: C) Stab. 21. We will celebrate the ..... Republic day on 26th Jan 2022. A) Actually. B) Cute. C) 69th. D) Gang. Show Answer Correct Answer: D) Gang. 22. The reference standard used for defining atomic mass unit is A) H-1. B) C-13. C) O-16. D) C-12. Show Answer Correct Answer: D) C-12. 23. Which has more number of atoms, 100g of Sodium or 100g of Iron A) Sodium. B) Iron. C) Fes. D) Fe. Show Answer Correct Answer: A) Sodium. 24. Which unit is used to express atomic mass? A) Gram. B) Kilogram. C) Atomic Mass Unit (amu). D) Mole. Show Answer Correct Answer: C) Atomic Mass Unit (amu). 25. Which of the following is a neutral oxide? A) CO$_{2}$. B) N $ _ {2} $ O $ _ {5} $. C) At $ _ {2} $ o $ _ {3} $. D) CO. Show Answer Correct Answer: D) CO. ← 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 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books