This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What part of an atom is NEGATIVELY charged? A) Neutrons. B) Electrons. C) Protons. D) Atoms. Show Answer Correct Answer: B) Electrons. 2. What is the atomicity of Sulphur A) 4. B) 1. C) 2. D) 8. Show Answer Correct Answer: D) 8. 3. Who named indivisible particles as 'atoms'? A) The heels of Maharish. B) John Dalton. C) Democritus. D) Proust. Show Answer Correct Answer: C) Democritus. 4. We generally calculate the formula unit mass for the ionic compounds. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. What is the chemical formula of sodium carbonate? A) NaHCO $ _ {3} $. B) On $ _ {2} $ co $ _ {3} $. C) Naco $ _ {3} $. D) To $ _ {2} $ hco $ _ {3} $. Show Answer Correct Answer: B) On $ _ {2} $ co $ _ {3} $. 6. Sulphide is an ion formed from only one type of atoms. (True / False) A) True. B) False. C) Can be true or false. D) None of the above. Show Answer Correct Answer: A) True. 7. Q9) The number of moles of oxygen atom in 2 moles of nitric acid? A) 7. B) 6. C) 8. D) 5. Show Answer Correct Answer: B) 6. 8. 'S' is the symbol of ..... A) Silicon. B) Sulfur. C) Sodium. D) Above all. Show Answer Correct Answer: B) Sulfur. 9. Q2) How many moles are present in 40 g of He? A) 13 moles. B) 12 moles. C) 11 moles. D) 10 moles. Show Answer Correct Answer: D) 10 moles. 10. A sample of NH$_{3}$ molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. QUESTION:The above data/extract/source supports which of the following law? A) Law of Conservation of Mass. B) Dalton's Atomic Postulate. C) Law of Constant Proportion. D) Law of conservation of Momentum. Show Answer Correct Answer: C) Law of Constant Proportion. 11. Which of the following has the highest atomic mass? A) Hydrogen. B) Carbon. C) Nitrogen. D) Oxygen. Show Answer Correct Answer: D) Oxygen. 12. The atomicity of K$_{2}$Cr$_{2}$O$_{7}$ is: A) 11. B) 9. C) 10. D) 12. Show Answer Correct Answer: A) 11. 13. The example of minoatomic ions is A) Carbonate ion. B) Sulphate ion. C) Chloride ion. D) Phosphate ion. Show Answer Correct Answer: C) Chloride ion. 14. What is the molar mass of carbon? A) 6.0 g/mol. B) 6.02 x 10$^{23 }$g/mol. C) 22.4 g/mol. D) 12.0 g/mol. Show Answer Correct Answer: D) 12.0 g/mol. 15. Convert it into mole i) 20 g of water A) 1.37 mole. B) 2 moles. C) 1.23 mole. D) 1.1 mole. Show Answer Correct Answer: D) 1.1 mole. 16. What is the mass of one mole of a substance called? A) Atomic mass. B) Formula mass. C) Molecular mass. D) Molar mass. Show Answer Correct Answer: D) Molar mass. 17. Amu is the abbrevation unit of? A) Volume. B) Mass. C) Mole. D) No. of particles. Show Answer Correct Answer: B) Mass. 18. Name the scientist who put forth the law of constant proportion A) Antoine lavoisier. B) Newton. C) Rutherford. D) J.L.PROUST. Show Answer Correct Answer: D) J.L.PROUST. 19. Which one of these is an ion? A) Cl$_{2}$. B) H$_{2}$O. C) That $^{+} $. D) Na. Show Answer Correct Answer: C) That $^{+} $. 20. Atomic mass of sodium is A) 13. B) 19. C) 23. D) 21. Show Answer Correct Answer: C) 23. 21. Who named the smallest particles are called Parmanu A) Dalton. B) You have. C) Lavoisier. D) Katyayama. Show Answer Correct Answer: B) You have. 22. Which has more molecular mass:NH$_{3}$ or O$_{2 }$?(Atomic mass of N = 14, H = 1, O = 16) A) NH$_{3}$. B) O$_{2 }$. C) Both have same molecular mass. D) None of the above. Show Answer Correct Answer: B) O$_{2 }$. 23. What is the valency of an element? A) The number of neutrons in the nucleus. B) The combining capacity of an element. C) The number of protons in the nucleus. D) The number of electrons in the outermost shell. Show Answer Correct Answer: B) The combining capacity of an element. 24. The combining capacity of an element is called A) Valence electron. B) Valency. C) Atomic number. D) Atomicity. Show Answer Correct Answer: B) Valency. 25. What is the molecular formula of hydrochloric acid? A) H2Cl. B) HCl. C) HCl2. D) None of the above. Show Answer Correct Answer: B) HCl. 26. Which of the following represents a correct chemical formula of Sodium chloride A) D) Nacl. B) (b) Bipo $ _ {4} $. C) (a) CaCl. D) C) NaSO$_{4}$. Show Answer Correct Answer: A) D) Nacl. 27. The short-hand notation of an element is called ..... A) Formula. B) Representation. C) Mark. D) Symbol. Show Answer Correct Answer: D) Symbol. 28. The valency of nitrogen in NH3 is A) 4. B) 2. C) 1. D) 3. Show Answer Correct Answer: D) 3. 29. The combining power (or capacity) of an element is known as its A) Charge. B) Valence electrons. C) Valency. D) Oxidation number. Show Answer Correct Answer: C) Valency. 30. Two or more atoms chemically bonded together are called a A) Atom. B) Element. C) Mixture. D) Molecule. Show Answer Correct Answer: D) Molecule. 31. Who was the first scientist to use symbols for elements in a very specific sense. A) Avagadro. B) Lavoisier. C) Dalton. D) Rutherford. Show Answer Correct Answer: C) Dalton. 32. The reactants of the equation CO$_{2}$ + 2H$_{2}$ $\rightarrow$ CH$_{3}$OH is: A) CO$_{2}$ and H$_{2}$. B) Only H$_{2}$. C) CO$_{2, }$H$_{2 }$and CH$_{3}$OH. D) CO$_{2 }$and CH$_{3}$OH. Show Answer Correct Answer: A) CO$_{2}$ and H$_{2}$. 33. One atomic mass unit is a mass unit equal to exactly Carbon A) 1/16th. B) 1/12th. C) 1/14th. D) 1/10th. Show Answer Correct Answer: B) 1/12th. 34. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of hydrogen would be required to react completely with 56 g of oxygen gas? A) 448 g. B) 8 g. C) 7 g. D) 1 g. Show Answer Correct Answer: C) 7 g. 35. Atomicity of chlorine and ozone A) Monoatomic, triatomic. B) Diatomic, triatomic. C) Monoatomic, tetratomic. D) Both are monoatomic. Show Answer Correct Answer: B) Diatomic, triatomic. 36. ASSERTION:Law of conservation of mass holds good for all the reactions REASON:It states that energy can neither be created nor be distroyed in an chemical reaction. A) A and R both are true and R is correct explanation of A. B) A and R both are true but R is not correct explanation of A. C) A is true but R i false. D) A is false but R is true. Show Answer Correct Answer: A) A and R both are true and R is correct explanation of A. 37. What makes one atom different from another? A) The number of protons in the nucleus. B) The atomic number. C) The number of electrons. D) The number of atoms. Show Answer Correct Answer: A) The number of protons in the nucleus. 38. Which one will have more number of molecules in the given samples? A) 3 moles of CO$_{2}$. B) 2 moles of NH$_{3}$. C) 1 mole of H$_{2}$SO$_{4}$. D) None of the above. Show Answer Correct Answer: A) 3 moles of CO$_{2}$. 39. What is a molecule? A) Two elements bonded together (sharing electrons). B) A mixture of different substances. C) Smallest individual particles. D) Salt mixed in water. Show Answer Correct Answer: A) Two elements bonded together (sharing electrons). 40. The valency of the halogen present in second period is ..... A) 5. B) 7. C) 1. D) 3. Show Answer Correct Answer: C) 1. 41. G of CO$_{2}$ is equal to ..... mol A) 0.3. B) 0.1. C) 0.2. D) 2.0. Show Answer Correct Answer: B) 0.1. 42. Symbol for Gold is ..... A) F. B) Pb. C) Au. D) Go. Show Answer Correct Answer: C) Au. 43. Q7) An atom has a mass number of 23 and atomic number of 11. The number of neutrons are A) 23. B) 11. C) 12. D) None of these. Show Answer Correct Answer: C) 12. 44. Atomic mass of hydrogen is 1 u whereas atomic mass of helium is 4 u. From this, we can generally conclude that 1 mole of hydrogen will have same mass as ..... moles of helium. A) 0.25. B) 4. C) 1. D) 0.5. Show Answer Correct Answer: A) 0.25. 45. The nitrogen in air has two nitrogen atoms bonded together. This nitrogen is A) An atom. B) An element. C) A molecule. D) A compound. Show Answer Correct Answer: C) A molecule. 46. Which of the following elements is diatomic in nature? A) Carbon. B) Neon. C) Helium. D) Oxygen. Show Answer Correct Answer: D) Oxygen. 47. How many Sulfur atoms are in this compound? Al$_{2}$(SO$_{4}$)$_{3}$ A) 4. B) 3. C) 1. D) 2. Show Answer Correct Answer: B) 3. 48. Name the elements represented by following symbols:Pb Sn A) Tin. Copper. B) Lead. Aluminium. C) Hydrogen., Boron. D) Lead, Tin. Show Answer Correct Answer: D) Lead, Tin. 49. When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? A) 14 g. B) 47 g. C) 53 g. D) 11 g. Show Answer Correct Answer: D) 11 g. 50. What does conservation of matter mean? A) Matter cycles through an ecosystem and 10% is lost as you move through each trophic level. B) Matter cannot be created, but can be destroyed. C) Matter cannot be created nor destroyed, and cycles through ecosystems. D) Matter and energy both move through ecosystems with 100% efficiency. Show Answer Correct Answer: C) Matter cannot be created nor destroyed, and cycles through ecosystems. 51. What are atoms composed of? A) Protons and electrons. B) Protons, neutrons, and electrons. C) Neutrons and electrons. D) Ions, elements, and compounds. Show Answer Correct Answer: B) Protons, neutrons, and electrons. 52. Sodium chloride (NaCl) is not a molecule. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 53. When you cool matter, what happens to the atoms and molecules? A) They stop moving. B) They move slower. C) They stay the same. D) They move faster. Show Answer Correct Answer: B) They move slower. 54. ..... are substances that are made up of different kinds of atoms. A) Use. B) Compounds. C) Elements. D) Atoms. Show Answer Correct Answer: B) Compounds. 55. "In a chemical reaction, atoms can neither be created nor destroyed." This statement is supported by: A) Law of conservation of mass. B) Law of definite proportion. C) All the above. D) None of the above. Show Answer Correct Answer: A) Law of conservation of mass. 56. Atoms combine to make A) Electrons. B) Neutrons. C) Protons. D) Molecules. Show Answer Correct Answer: D) Molecules. 57. 98u is the molecular mass of A) NH3. B) CO2. C) Caco3. D) H2SO4. Show Answer Correct Answer: D) H2SO4. 58. Three components of atom A) Neutron, Nucleus, Electron. B) Quark, Proton, nucleus. C) Electron, Proton, Neutron. D) None. Show Answer Correct Answer: C) Electron, Proton, Neutron. 59. Valency of inert gas elements. A) 1. B) 3. C) 0. D) 2. Show Answer Correct Answer: C) 0. 60. What is the atomicity of K2CrO4? A) 7. B) 10. C) 12. D) 8. Show Answer Correct Answer: A) 7. ← PreviousNext →Related QuizzesScience QuizzesClass 9 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 6Class 9 Science Chapter 3 Atoms And Molecules Quiz 7 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books