This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > 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 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The atomicity of oxygen in Aluminium Oxide is A) 2. B) 1. C) 3. D) 6. Show Answer Correct Answer: C) 3. 2. An element X has 7 electrons in the outermost shell and forms ion with symbol A) X$^{-}$. B) X$^{-3}$. C) X$^{-5}$. D) X$^{-2}$. Show Answer Correct Answer: A) X$^{-}$. 3. H$_{2}$SO$_{4}$ Is the chemical formula of ..... A) Hydrogen Chloride. B) Nitric acid. C) Sulphuric acid. D) Carbonic acid. Show Answer Correct Answer: C) Sulphuric acid. 4. 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. 5. Which is a molecule? A) CO. B) Li. C) He. D) C. Show Answer Correct Answer: A) CO. 6. 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) 2. D) 1.5. Show Answer Correct Answer: D) 1.5. 7. What is the mass of 0.40 mol of CO$_{2}$ A) 12.8 g. B) 17.6 g. C) 40 g. D) 18.6 g. Show Answer Correct Answer: B) 17.6 g. 8. Q4) Which of the following can be used to see atoms? A) Microscope. B) Scanning tunneling microscope. C) Optical microscope. D) Most powerful Microscope. Show Answer Correct Answer: B) Scanning tunneling microscope. 9. Atom is smallest particle of an ..... A) Gas. B) Element. C) Liquid. D) Solid. Show Answer Correct Answer: B) Element. 10. Atomic radius is measured in A) Nanometres. B) Metres. C) Centimetres. D) None of the above. Show Answer Correct Answer: A) Nanometres. 11. 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. 12. K is symbol of which element? A) Krypton. B) Potassium. C) Carbon. D) Phosphorus. Show Answer Correct Answer: B) Potassium. 13. 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. 14. Simple substance made up of only one kind of atom A) Compound. B) Mixture. C) Atom. D) Molecules. E) Element. Show Answer Correct Answer: E) Element. 15. Symbol of potassium A) Na. B) Fe. C) K. D) Pb. Show Answer Correct Answer: C) K. 16. THE PERCENTAGE OF CARBON IN CARBONMONOXIDE CO A) 14. B) 43. C) 12. D) 32. Show Answer Correct Answer: B) 43. 17. CO is symbol of which element? A) Copper. B) Chromium. C) CO is a compound. D) Cobalt. Show Answer Correct Answer: C) CO is a compound. 18. Atomic mass of Chlorine is ..... (u) A) 35.5. B) 34.5. C) 34. D) 35. Show Answer Correct Answer: A) 35.5. 19. 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. 20. 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. 21. What is the chemical name of MgCl2? A) Magnesium Chloride. B) Magnesium Dichloride. C) Magnesium (II) Chloride. D) Magnesium Chloride 2. Show Answer Correct Answer: A) Magnesium Chloride. 22. Which of the following is not a polyatomic ion? A) Sulphite. B) Sulphate. C) Sulphide. D) Bisulphide. Show Answer Correct Answer: C) Sulphide. 23. 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. 24. 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. 25. Who proposed the atomic theory? A) Ernest Rutherford. B) J.J. Thomson. C) John Dalton. D) Niels Bohr. Show Answer Correct Answer: C) John Dalton. 26. What are the building blocks of matter? A) Cells. B) Neutrons. C) Protons. D) Atoms. Show Answer Correct Answer: D) Atoms. 27. The mass of ..... is equivalent to one more atomic mass unit A) 1/12 Hydrogen Atom. B) 1/12 Carbon Atom. C) 1/12 Sodium Atom. D) 1 Carbon Atom. Show Answer Correct Answer: B) 1/12 Carbon Atom. 28. What element is in every living organism? A) Gold. B) Carbon. C) Lead. D) Helium. Show Answer Correct Answer: B) Carbon. 29. What is the mass of a proton and a neutron? A) 13 Amo. B) 1amu. C) 10cm. D) 2grams. Show Answer Correct Answer: B) 1amu. 30. 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. 31. In covalent bonding, valence electrons are ..... A) Shared. B) Transferd. C) Destroyed. D) None of the above. Show Answer Correct Answer: A) Shared. 32. The Chemical formula of Ammonium Chloride is A) NH$_{4}$Cl. B) NH$_{4}$Cl$_{2}$. C) (NH$_{4}$)$_{2}$Cl$_{2}$. D) (NH$_{4}$)Cl. Show Answer Correct Answer: A) NH$_{4}$Cl. 33. 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. 34. A sample of NH$_{3 }$molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports: A) Avogadros Law. B) Law of Conservation of Mass. C) Law of Definite Proportions. D) Las of Multiple Proportions. Show Answer Correct Answer: C) Law of Definite Proportions. 35. What is the symbol of silicon A) S. B) And. C) SL. D) Sc. Show Answer Correct Answer: B) And. 36. What is the unit used to measure weighted average atomic mass? A) Amu. B) Angstrom. C) Gram. D) Nanogrm. Show Answer Correct Answer: A) Amu. 37. 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. 38. If atomic mass of Chlorine is 36. Find the number of neutrons? A) 18. B) 20. C) 19. D) 17. Show Answer Correct Answer: C) 19. 39. The smallest unit of an element that retains the properties of that element is called A) An atom. B) A Molecule. C) A neutron. D) A proton. Show Answer Correct Answer: A) An atom. 40. The smallest part of an element is known as the A) Periodic Table. B) Atom. C) Group. D) Period. Show Answer Correct Answer: B) Atom. 41. Which element has the chemical symbol 'Fe'? A) Fluorine. B) Francium. C) Iron. D) Fermium. Show Answer Correct Answer: C) Iron. 42. State the atomicity of $s_8$ A) Polyatomic. B) Monoatomic. C) Tetraatomic. D) Diatomic. Show Answer Correct Answer: A) Polyatomic. 43. Electrons are not factored into atomic mass because: A) They are so small their mass is negligible. B) They're not in the nucleus. C) They're too big. D) They move so quickly their mass is zero. Show Answer Correct Answer: A) They are so small their mass is negligible. 44. The formula of Ammonium Sulphate is ..... A) NH$_{4}$SO$_{2}$. B) (NH$_{4}$)$_{2}$SO$_{4}$. C) NH$_{2}$SO$_{4}$. D) NH$_{4}$SO$_{4}$. Show Answer Correct Answer: B) (NH$_{4}$)$_{2}$SO$_{4}$. 45. The relative molecular mass of Na2S2O3.5H2O is A) (d) 248 g. B) (a) 250 amu. C) (b) 250 g. D) C) 248 amu. Show Answer Correct Answer: A) (d) 248 g. 46. The molecular formula of potassium nitrate is ..... A) KNO. B) KNO$_{3}$. C) When. D) KNO$_{2}$. Show Answer Correct Answer: B) KNO$_{3}$. 47. The compounds or elements present at the end of a reaction A) Products. B) Energy. C) Reactants. D) Catalyst. Show Answer Correct Answer: A) Products. 48. Which law states that mass can neither be created nor be destroyed and given by ..... A) Law of conservation. B) Law of definite, Antonie Lavoisier. C) Law of conservation, Proust. D) None of the above. Show Answer Correct Answer: A) Law of conservation. 49. The no. of moles in 32 g of Helium are A) 18 mole. B) 2 mole. C) 4 mole. D) 8 mole. Show Answer Correct Answer: C) 4 mole. 50. What is a compound? A) Two substances stuck together with glue. B) A mixture of different substances. C) Two different elements bonded together. D) Two of the same elements bonded together. Show Answer Correct Answer: C) Two different elements bonded together. 51. The chemical symbol for nitrogen gas is A) N2. B) N. C) In. D) IN. Show Answer Correct Answer: A) N2. 52. The lightest element is A) Hydrogen. B) Helium. C) Carbon. D) Copper. Show Answer Correct Answer: A) Hydrogen. 53. Which of the following is a noble gas A) Aluminium. B) Hydrogen. C) Oxygen. D) Helium. Show Answer Correct Answer: D) Helium. 54. The atomic symbol of Iron is ..... A) Fe. B) I. C) And. D) Fu. Show Answer Correct Answer: A) Fe. 55. All atoms are most stable with (or would "prefer") how many electrons in their valence shell? A) 2. B) 8. C) 18. D) 1. Show Answer Correct Answer: B) 8. 56. Combination of atoms of same elements is known as A) Element. B) Atom. C) Molecule. D) Compound. Show Answer Correct Answer: C) Molecule. 57. Which of the following has maximum number of atoms? A) 1g of H$_{2}$O. B) 1g of CH$_{4}$. C) 1g of CO$_{2}$. D) 1g of O$_{2}$. Show Answer Correct Answer: B) 1g of CH$_{4}$. 58. What is the mass of 1 mol of Nitrogen atoms? A) 1.Hgg. B) Hgum. C) 1410g. D) 14g. Show Answer Correct Answer: D) 14g. 59. What is lacking in the meristematic tissue from the following? A) Cellulose. B) Vacuole. C) Nucleus. D) Dense cytoplasm. Show Answer Correct Answer: B) Vacuole. 60. Number of atoms of O in 34 gram H$_{2}$O$_{2}$ is(Given:O = 16 u, H = 1 u) A) 2 N$_{A}$. B) 4 N$_{A}$. C) 3 N$_{A}$. D) N$_{A}$. Show Answer Correct Answer: A) 2 N$_{A}$. ← PreviousNext →Related QuizzesScience QuizzesClass 9 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 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books