This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The nucleus of an atom is made up of ..... A) Protons and Neutrino. B) Neutrons and Electrons. C) Protons and Neutrons. D) Protons and Electrons. Show Answer Correct Answer: C) Protons and Neutrons. 2. What is the chemical symbol for the element Carbon? A) C. B) Ca. C) Carb. D) CO. Show Answer Correct Answer: A) C. 3. The chemical symbol for sodium A) S. B) Na. C) So. D) Na. Show Answer Correct Answer: B) Na. 4. Which correctly describes the smallest amount of an element? A) Atom. B) Molecule. C) Compound. D) Proton. Show Answer Correct Answer: A) Atom. 5. 2 elements C & D combines to form a compound CD. The same compound is obtained from different experiment. give the law in accordance to above observation A) Law of conservation of mass. B) Law of constant proportion. C) Law of multiple proportion. D) None of the above. Show Answer Correct Answer: B) Law of constant proportion. 6. Mass can neither be created nor destroyed is A) Law of Chemical Combination. B) Law of Constant Proportion. C) Law of Conservation of mass. D) None of these. Show Answer Correct Answer: C) Law of Conservation of mass. 7. When there is no subscript after an element's symbol, it means there are how many atoms of that element? A) 0. B) 1. C) 2. D) Unknown. Show Answer Correct Answer: B) 1. 8. THE CHEMICAL FORMULAE OF CALCIUM BUCARBONATE A) CA (HCO3) 2. B) As a. C) Caco3. D) CA (OH) 2. Show Answer Correct Answer: A) CA (HCO3) 2. 9. The Valency of Argon is A) 1. B) 2. C) 8. D) 0. Show Answer Correct Answer: D) 0. 10. Which is noble element A) Na. B) Cl. C) He. D) Ca. Show Answer Correct Answer: C) He. 11. Hydragyrum is the Latin name of ..... A) Iron. B) Mercury. C) Tin. D) Tungsten. Show Answer Correct Answer: B) Mercury. 12. Percentage of calcium in calcium carbonate is $Calcium:40g^{ }\\\\Carbon:12g\\\\\\Oxygen:16g$ A) 40. B) 30. C) 50. D) 68. Show Answer Correct Answer: A) 40. 13. Symbols of Chlorine and Zinc are? A) CL and zn. B) CL and Zn. C) Cl and ZN. D) Cl and Zn. Show Answer Correct Answer: D) Cl and Zn. 14. Which of the following elements is diatomic? A) Chlorine. B) Sodium. C) Sulphur. D) Aluminium. Show Answer Correct Answer: A) Chlorine. 15. Which of the following statements regarding the mole is incorrect? A) A mole is a counting unit equal to 6.02 x 1023 particles. B) The number of particles in a mole is known as Avogadro's number. C) A mole of particles of an element is numerically equal to the atomic mass of the element. D) None of the above. Show Answer Correct Answer: D) None of the above. 16. Who named indivisible particles as 'parmanu'? A) The heels of Maharish. B) John Dalton. C) Proust. D) Democritus. Show Answer Correct Answer: A) The heels of Maharish. 17. Who Proposed the law of multiple proportion? A) Antoine Lavoisier. B) Joseph L Proust. C) John Dalton. D) Neil's Bohr. Show Answer Correct Answer: C) John Dalton. 18. What is the chemical symbol for the element Chlorine? A) C. B) Ci. C) Cn. D) Cl. Show Answer Correct Answer: D) Cl. 19. What is the basic unit of matter and is the smallest particle of an element? A) Atoms. B) Elements. C) Compounds. D) Molecules. Show Answer Correct Answer: A) Atoms. 20. Which one of these items is NOT a solid with a repeating pattern? A) Butter. B) Salt. C) Snowflake. D) Diamond. Show Answer Correct Answer: A) Butter. 21. The Chemical formula of lime water is A) Cao. B) HF. C) CO. D) None of these. Show Answer Correct Answer: A) Cao. 22. Lighest particle in an atom is? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: B) Electron. 23. Convert into mole.i)12g of oxygen gas A) 0.375. B) 375. C) 37.5. D) 3.75. Show Answer Correct Answer: A) 0.375. 24. Chemical formula of Sodium Carbonate. A) NaHCO $ _ {3} $. B) On $ _ {2} $ co $ _ {3} $. C) NaOH. D) That $ _ {2} $ so $ _ {4} $. Show Answer Correct Answer: B) On $ _ {2} $ co $ _ {3} $. 25. Which scientist discovered the electron? A) J.J. Thomson. B) John Dalton. C) Ernest Rutherford. D) Niels Bohr. Show Answer Correct Answer: A) J.J. Thomson. ← 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 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