This quiz works best with JavaScript enabled. Home > Class 9 > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The ..... has a negative charge. A) Proton. B) Electron. C) Positron. D) Neutron. Show Answer Correct Answer: B) Electron. 2. Symbol of Atomic number is? A) S. B) N. C) A. D) Z. Show Answer Correct Answer: D) Z. 3. Chemical formula of aluminium and hydrogen is A) Aloh. B) Al(OH)3. C) AL(OH)2. D) Aloh. Show Answer Correct Answer: B) Al(OH)3. 4. Molecular Mass of Glucose (C$_{6}$H$_{12}$O$_{6}$). A) 100 grams/Mole(Approx). B) 110 grams / Mole (Approx). C) 180 grams/Mole(Approx). D) 0.8809 gram/Mole(Approx). Show Answer Correct Answer: C) 180 grams/Mole(Approx). 5. Who have the theory of constant proportion A) Avogadro. B) Proust. C) Lavoisier. D) Lussa. Show Answer Correct Answer: B) Proust. 6. Smallest particle of matter called ..... A) Tiny particle. B) Tiny molecule. C) Molecule. D) Atom. Show Answer Correct Answer: D) Atom. 7. What is the atomic mass of carbon? A) 1 amu. B) 12 amu. C) 16 amu. D) 18 amu. Show Answer Correct Answer: B) 12 amu. 8. Molecular mass is defined as the: A) Mass of one molecule of any substance compared with the mass of one atom of C-12. B) Mass of one atom compared with the mass of one atom of hydrogen. C) Mass of one atom compared with the mass of one molecule. D) All of the above. Show Answer Correct Answer: A) Mass of one molecule of any substance compared with the mass of one atom of C-12. 9. An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be: A) XY. B) Wood $ _ {2} $. C) Wood $ _ {2} $. D) XY$_{4}$. Show Answer Correct Answer: B) Wood $ _ {2} $. 10. The atomicity of oxygen in Aluminium Oxide is A) 1. B) 2. C) 3. D) 6. Show Answer Correct Answer: C) 3. 11. An element X has 7 electrons in the outermost shell and forms ion with symbol A) X$^{-}$. B) X$^{-2}$. C) X$^{-5}$. D) X$^{-3}$. Show Answer Correct Answer: A) X$^{-}$. 12. H$_{2}$SO$_{4}$ Is the chemical formula of ..... A) Hydrogen Chloride. B) Sulphuric acid. C) Nitric acid. D) Carbonic acid. Show Answer Correct Answer: B) Sulphuric acid. 13. Which of the following statements regarding the mole is correct? A) A mole is a counting unit equal to 6.02 x 10$^{23}$ entity. B) The number of atoms in a mole is known as Avogadro's number. C) A mole of atom of an element is numerically equal to the atomic mass of the element. D) All are correct. Show Answer Correct Answer: D) All are correct. 14. Which is a molecule? A) C. B) CO. C) He. D) Li. Show Answer Correct Answer: B) CO. 15. How many moles of H atoms are present in 3.011 x 10$^{23}$ molecules of ammonia (NH$_{3}$)? A) 0.5. B) 1. C) 1.5. D) 2. Show Answer Correct Answer: C) 1.5. 16. What is the mass of 0.40 mol of CO$_{2}$ A) 18.6 g. B) 12.8 g. C) 17.6 g. D) 40 g. Show Answer Correct Answer: C) 17.6 g. 17. Q4) Which of the following can be used to see atoms? A) Microscope. B) Optical microscope. C) Most powerful Microscope. D) Scanning tunneling microscope. Show Answer Correct Answer: D) Scanning tunneling microscope. 18. Atom is smallest particle of an ..... A) Solid. B) Liquid. C) Element. D) Gas. Show Answer Correct Answer: C) Element. 19. Atomic radius is measured in A) Nanometres. B) Metres. C) Centimetres. D) None of the above. Show Answer Correct Answer: A) Nanometres. 20. What is the Periodic Table? A) A chart that shows all the elements scientists have discovered/created. B) A chart that lists all the molecules that exist in the universe. C) A chart that tells who discovered each element. D) A chart that lists all the molecules found in nature. Show Answer Correct Answer: A) A chart that shows all the elements scientists have discovered/created. 21. K is symbol of which element? A) Potassium. B) Krypton. C) Phosphorus. D) Carbon. Show Answer Correct Answer: A) Potassium. 22. Smallest particle that takes part in chemical reaction according to dalton A) Electron. B) Quarks. C) None. D) Atom. Show Answer Correct Answer: D) Atom. 23. Simple substance made up of only one kind of atom A) Mixture. B) Compound. C) Atom. D) Element. E) Molecules. Show Answer Correct Answer: D) Element. 24. Symbol of potassium A) Pb. B) Na. C) Fe. D) K. Show Answer Correct Answer: D) K. 25. THE PERCENTAGE OF CARBON IN CARBONMONOXIDE CO A) 12. B) 14. C) 32. D) 43. Show Answer Correct Answer: D) 43. ← 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 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