This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > 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 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which postulate of Dalton's atomic theory can explain the law of definite proportions? A) Atoms combine in the ratio of small whole numbers to form compounds. B) The relative number and kinds of atoms are constant in a given compound. C) Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. D) Atoms of different elements have different masses and chemical properties. Show Answer Correct Answer: B) The relative number and kinds of atoms are constant in a given compound. 2. How is matter recycled in ecosystems? A) Matter can take on different forms as it goes through different processes. B) Matter moves through ecosystems through biogeochemical cycles. C) Matter is recycled as organisms in different trophic levels consume and finally when decomposers return matter to the ecosystem. D) All of these are true. Show Answer Correct Answer: D) All of these are true. 3. Atomic mass is expressed in A) Amu. B) Gm. C) Kg. D) Ml. Show Answer Correct Answer: A) Amu. 4. Q1) Which of the following is correct pair of elements and its symbols? A) Zinc-s. B) Potassium-P. C) Iron-Fe. D) Silver-SI. Show Answer Correct Answer: C) Iron-Fe. 5. The formula of lead is A) PB. B) Pb. C) Fb. D) None of the above. Show Answer Correct Answer: B) Pb. 6. "Matter can be neither be created nor be destroyed" is stated by A) Dalton's Atomic theory. B) Proust's law. C) Law of defined proportions. D) Law of conservation of mass. Show Answer Correct Answer: D) Law of conservation of mass. 7. Which element has the atomic number 6? A) Oxygen. B) Nitrogen. C) Carbon. D) Hydrogen. Show Answer Correct Answer: C) Carbon. 8. Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen would be required to react completely with 3 g of hydrogen gas? A) 24 g. B) 16 g. C) 32 g. D) 8 g. Show Answer Correct Answer: A) 24 g. 9. The formula of quick lime is A) Caco3. B) CaCl2. C) CaO. D) MgO. Show Answer Correct Answer: C) CaO. 10. Elements are made of A) The periodic table. B) Molecules. C) One type of atom. D) Many types of atoms. Show Answer Correct Answer: C) One type of atom. 11. The chemical symbol for sodium is A) Na. B) So. C) NA. D) Sd. Show Answer Correct Answer: A) Na. 12. To form a chemical formula, we need to know about 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. 13. What is the atomic mass of nitrogen? A) 12 amu. B) 14 amu. C) 16 amu. D) 1 amu. Show Answer Correct Answer: B) 14 amu. 14. What is the chemical symbol of the element Hydrogen? A) Hg. B) Hydro. C) Hy. D) H. Show Answer Correct Answer: D) H. 15. What does the atomic number represent? A) How many atoms are in a group. B) How much an atom weighs. C) The number of protons in the nucleus of the atom. D) None of the above. Show Answer Correct Answer: C) The number of protons in the nucleus of the atom. 16. What is the charge of an electron? A) +1. B) -1. C) 0. D) None of the above. Show Answer Correct Answer: B) -1. 17. Symbol of copper A) Cu. B) Co. C) Cu. D) CU. Show Answer Correct Answer: A) Cu. 18. Calculate the formula unit mass of ZnO A) Put out. B) Member. C) 81U. D) 83U. Show Answer Correct Answer: C) 81U. 19. What is the molecular mass of acetic acid ( CH3 COOH)? A) 90 u. B) 56 u. C) 60 u. D) 46 u. Show Answer Correct Answer: C) 60 u. 20. Molecules are compared to A) Numbers. B) Words. C) Algebra. D) Sentences. Show Answer Correct Answer: B) Words. 21. Q8) The balancing of Chemical equations is based upon A) Law of combining volumes. B) Law of multiple proportion. C) Law of definite proportion. D) Law of conservation of mass. Show Answer Correct Answer: D) Law of conservation of mass. 22. Animals take in energy as ..... and convert it to ..... , the energy cells can use. A) Fat, ATP. B) Glucose, ADP. C) Glucose, ATP. D) Fat, ADP. Show Answer Correct Answer: C) Glucose, ATP. 23. 1) Number Valance shell and Electron in Nitrogen atom.*Choose the most appropriate option 2) Electronic configuration of element Ar3) Valency of element P A) L shell, 5 2) 2, 8, 8, 13) 3. B) L shell, 5 2) 2, 2, 8, 83) X. C) L shell, 6 2) 2, 8, 8, 0 3) 3, 0. D) L shell, 5 2) 2, 8, 8, -3) 3, 5. Show Answer Correct Answer: D) L shell, 5 2) 2, 8, 8, -3) 3, 5. 24. In a chemical reaction 150 g Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will left in food? A) 36 grams. B) 65 grams. C) 87 grams. D) 63 grams. Show Answer Correct Answer: D) 63 grams. 25. The molar mass of Laughing gas is A) 44 g/mol. B) 44 u. C) 56 g/mol. D) 56 u. Show Answer Correct Answer: A) 44 g/mol. 26. How many atoms are present in a (I) H2 S molecule and (ii) PO4 (3-) A) 7, 8. B) 5, 4. C) 3, 5. D) 5, 3. Show Answer Correct Answer: C) 3, 5. 27. The atomicity of white Phosphorus is A) 4. B) 5. C) 3. D) 6. Show Answer Correct Answer: A) 4. 28. Different elements exist due to? A) Different number of atoms in elements. B) Different number of molecules. C) Different number of protons. D) None of the above. Show Answer Correct Answer: C) Different number of protons. 29. 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. 30. What is the chemical symbol for the element Carbon? A) Ca. B) Carb. C) C. D) CO. Show Answer Correct Answer: C) C. 31. Which correctly describes the smallest amount of an element? A) Compound. B) Molecule. C) Proton. D) Atom. Show Answer Correct Answer: D) Atom. 32. 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. 33. 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. 34. When there is no subscript after an element's symbol, it means there are how many atoms of that element? A) Unknown. B) 1. C) 0. D) 2. Show Answer Correct Answer: B) 1. 35. THE CHEMICAL FORMULAE OF CALCIUM BUCARBONATE A) Caco3. B) As a. C) CA (OH) 2. D) CA (HCO3) 2. Show Answer Correct Answer: D) CA (HCO3) 2. 36. The Valency of Argon is A) 8. B) 2. C) 0. D) 1. Show Answer Correct Answer: C) 0. 37. Which is noble element A) Cl. B) Na. C) Ca. D) He. Show Answer Correct Answer: D) He. 38. Hydragyrum is the Latin name of ..... A) Mercury. B) Tin. C) Iron. D) Tungsten. Show Answer Correct Answer: A) Mercury. 39. Percentage of calcium in calcium carbonate is $Calcium:40g^{ }\\\\Carbon:12g\\\\\\Oxygen:16g$ A) 50. B) 68. C) 30. D) 40. Show Answer Correct Answer: D) 40. 40. 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. 41. Which of the following elements is diatomic? A) Sodium. B) Aluminium. C) Sulphur. D) Chlorine. Show Answer Correct Answer: D) Chlorine. 42. Who named indivisible particles as 'parmanu'? A) The heels of Maharish. B) Proust. C) Democritus. D) John Dalton. Show Answer Correct Answer: A) The heels of Maharish. 43. Who Proposed the law of multiple proportion? A) Antoine Lavoisier. B) John Dalton. C) Neil's Bohr. D) Joseph L Proust. Show Answer Correct Answer: B) John Dalton. 44. What is the chemical symbol for the element Chlorine? A) Cl. B) Cn. C) Ci. D) C. Show Answer Correct Answer: A) Cl. 45. What is the basic unit of matter and is the smallest particle of an element? A) Atoms. B) Elements. C) Molecules. D) Compounds. Show Answer Correct Answer: A) Atoms. 46. 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. 47. The Chemical formula of lime water is A) Cao. B) HF. C) CO. D) None of these. Show Answer Correct Answer: A) Cao. 48. Lighest particle in an atom is? A) Proton. B) Electron. C) Neutron. D) None of the above. Show Answer Correct Answer: B) Electron. 49. Convert into mole.i)12g of oxygen gas A) 3.75. B) 375. C) 37.5. D) 0.375. Show Answer Correct Answer: D) 0.375. 50. Chemical formula of Sodium Carbonate. A) NaHCO $ _ {3} $. B) On $ _ {2} $ co $ _ {3} $. C) That $ _ {2} $ so $ _ {4} $. D) NaOH. Show Answer Correct Answer: B) On $ _ {2} $ co $ _ {3} $. 51. Which scientist discovered the electron? A) Ernest Rutherford. B) Niels Bohr. C) J.J. Thomson. D) John Dalton. Show Answer Correct Answer: C) J.J. Thomson. 52. Calculate the molecular mass of HNO3 A) 42u. B) 65im. C) Stab. D) 68. Show Answer Correct Answer: C) Stab. 53. Which of the following has the maximum number of particles? A) 2 g of H$_{2}$. B) 4.4 g of CO $ _ {2} $. C) 8 g of CH$_{4}$. D) 34.2 g of C$_{12}$H$_{22}$O$_{11}$. Show Answer Correct Answer: A) 2 g of H$_{2}$. 54. The matter is made up of ..... A) Atoms. B) Elements. C) Compounds. D) Ions. Show Answer Correct Answer: A) Atoms. 55. The Latin name for 'Lead' is A) Ring. B) Lead. C) Wolfram. D) Hydrargyrum. Show Answer Correct Answer: B) Lead. 56. The formula unit mass of Al$_{2}$SO$_{3}$ is A) 180 u. B) 342 u. C) 236 u. D) 432 u. Show Answer Correct Answer: B) 342 u. 57. 4 grams of hydrogen reacts with some oxygen to make 36 grams of water. Figure out how much oxygen must have been used by applying the law of conservation of mass? A) 4 grams. B) 34 grams. C) 36 grams. D) 32 grams. Show Answer Correct Answer: D) 32 grams. 58. If Element A has more atomic mass than Element B, then 100 g of Element A will have more particles than 100 g of Element B. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 59. The volume of an atom is 10$^{y}$ times the volume of nucleus. Then y is ..... A) 5. B) 20. C) 15. D) 10. Show Answer Correct Answer: C) 15. 60. Measure mainly of the nuclear particles:protons + neutrons A) Atomic Number. B) Gluons. C) Atomic Mass. D) Subatomic Particles. Show Answer Correct Answer: C) Atomic Mass. ← 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 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