This quiz works best with JavaScript enabled. Home > Cbse > Class 9 > Science > Atoms And Molecules > Class 9 Science Chapter 3 Atoms And Molecules – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 9 Science Chapter 3 Atoms And Molecules Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The atomic symbol of silver is ..... A) And. B) S. C) Au. D) Ag. Show Answer Correct Answer: D) Ag. 2. Particles present in an atom are called? A) Anatomic particles. B) Preatomic particles. C) Subatomic particles. D) None of the above. Show Answer Correct Answer: C) Subatomic particles. 3. All noble gases have1. completely filled orbit2. monoatomic3. unreactive4. all the above A) 4. B) 1. C) 3. D) 2. Show Answer Correct Answer: A) 4. 4. Molecules and compounds are created when multiple atoms bond together, but how are they different? A) Compounds have to have atoms from different elements bonded together. B) Molecules have to have atoms from different elements bonded together. C) They are the same and there is no difference. D) Molecules are building blocks of compounds. Show Answer Correct Answer: A) Compounds have to have atoms from different elements bonded together. 5. The chemical formula of Bismuth Phosphate is A) Would $ _ {3} $ after $ _ {4} $. B) Would $ _ {2} $ (after $ _ {4} $) $ _ {3} $. C) Would (after $ _ {4} $) $ _ {3} $. D) B IPO$_{4}$. Show Answer Correct Answer: D) B IPO$_{4}$. 6. The atomocity of Ethanol is A) 2. B) 9. C) 7. D) 5. Show Answer Correct Answer: B) 9. 7. Molecular formula of copper and bromine is A) CUBR. B) Cu2br. C) Cubr2. D) CuBr. Show Answer Correct Answer: C) Cubr2. 8. Molar mass of C2H6 =?Given (C=12g ; H=1g) A) 30g. B) 15g. C) 32g. D) None of the above. Show Answer Correct Answer: A) 30g. 9. Which of the following is a chemical symbol? A) FeO. B) O. C) NaCl. D) H$_{2}$O. Show Answer Correct Answer: B) O. 10. The positive particles of an atom are A) Protons. B) Neutrons. C) Positrons. D) Electrons. Show Answer Correct Answer: A) Protons. 11. What is the term for combining 2 or more atoms together? A) Atoms. B) Elements. C) Compounds. D) Molecules. Show Answer Correct Answer: D) Molecules. 12. Which of the following is NOT a rule for matter? A) All matter is made of atoms. B) Atoms bond to other atoms to form compounds. C) Atoms are on the macro scale. D) Atoms last forever. Show Answer Correct Answer: C) Atoms are on the macro scale. 13. Which of these items is made up of one or more molecules? A) Neon. B) Salt. C) Hydrogen. D) Gold. Show Answer Correct Answer: B) Salt. 14. IUPAC stands for: A) International Understanding of Physics and Chemistry. B) International Union of Pure and Applied Chemistry. C) Indian Union of Pure and Applied Chemistry. D) International Union of Permutation and Combination. Show Answer Correct Answer: B) International Union of Pure and Applied Chemistry. 15. The molecule having an atomicity of 4 is: A) Phosphorous molecule. B) Sulphate molecule. C) Ozone molecule. D) Methane molecule. Show Answer Correct Answer: A) Phosphorous molecule. 16. According to Daltons's Atomic theory, "Atoms are indivisible particles which can neither be destroyed nor created." postulate describes A) Law of Conservation of Mass. B) Law of Constant Proportion. C) All the above. D) None of the above. Show Answer Correct Answer: A) Law of Conservation of Mass. 17. One Atomic mass unit= ..... A) 1/12 th mass of one atom of carbon-12 isotope. B) Mass of one atom of oxygen. C) 1/12 th mass of natural carbon. D) 1/16 th mass of one atom of natural carbon. Show Answer Correct Answer: A) 1/12 th mass of one atom of carbon-12 isotope. 18. If Element A has more atomic mass than Element B, then gram molar mass of Element A is more than gram molar mass of Element B. (True/False) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 19. Neutrons are ..... particles. A) Positive. B) Cows. C) Negative. D) Neutral. Show Answer Correct Answer: D) Neutral. 20. A substance made of only one kind of atom is a/an ..... A) Element. B) Compound. C) Atom. D) Molecule. Show Answer Correct Answer: A) Element. 21. Which one of the following is a triatomic molecule A) Helium. B) Hydrogen. C) Glucose. D) Carbon dioxide. Show Answer Correct Answer: D) Carbon dioxide. 22. Number of atoms in one molecule A) Molecules unit. B) Atomic unit. C) Electronic unit. D) All of above. Show Answer Correct Answer: B) Atomic unit. 23. Chlorine has two kind of atoms, Cl-35 and Cl-36. In both cases atomic number of chlorine is 17. Which brought the change? A) No of electrons. B) No of neutrons. C) No of protons. D) None of the above. Show Answer Correct Answer: B) No of neutrons. 24. What is the neutron? A) A positively charged particle found in the nucleus. B) A neutral particle that orbits the nucleus. C) A negatively charged particle that orbits the nucleus. D) A neutral particle found in the nucleus. Show Answer Correct Answer: D) A neutral particle found in the nucleus. 25. "In a compound, the elements always present in the fixed ratio of their mass." is a ..... A) Law of constant proportion. B) Law of conservation of mass. C) Law of multiple proportion. D) None of the above. Show Answer Correct Answer: A) Law of constant proportion. 26. Which statement is true for an anion A) They are negatively charged ions. B) They always gain electron and have electrons more than a normal atom. C) Both a and b. D) They are neutrals. Show Answer Correct Answer: C) Both a and b. 27. Write the chemical symbol for:I. Zinc II. Carbon III. HydrogenIV. Helium V. Copper A) I. ZN II.CI II.HEAVE.a v. c. B) I.ZN II.I.HEAVE.A v. c. C) Use. D) I.ZN II.I.HEAVE.A v. c. Show Answer Correct Answer: B) I.ZN II.I.HEAVE.A v. c. 28. 1 MOLE OF COMPOUND IS EQUAL TO A) N$_{0}$. B) ATOMIC NUMBER. C) DENSITY. D) NONE OF THE ABOVE. Show Answer Correct Answer: A) N$_{0}$. 29. A molecule is the smallest particle of an ..... A) Compound. B) Element. C) Compound and element. D) None of the above. Show Answer Correct Answer: A) Compound. 30. Atomic mass represented in grams is called as ..... A) Gram atomic mass(GAM). B) Gram molecular mass (GMM). C) Molar mass. D) None of the above. Show Answer Correct Answer: A) Gram atomic mass(GAM). 31. What do we call a chemical substance made up of 2 or more different types atoms bonded together? A) Atom. B) Formula. C) Subscript. D) Compound. Show Answer Correct Answer: D) Compound. 32. Mass of One mole is equal to A) Two gram atom. B) One molecule gram atom. C) One gram atom. D) All of these. Show Answer Correct Answer: C) One gram atom. 33. The atomic numbers of 3 elements A, B and C are 9, 10 and 13 respectively. Which ofthem will form a cation. A) A. B) B. C) C. D) None of the above. Show Answer Correct Answer: C) C. 34. Who proposed Law of Conservation of mass? A) Proust. B) Dalton. C) Democrats. D) Lavoisier. Show Answer Correct Answer: D) Lavoisier. 35. Substances that have only one kind of atom are called: A) Nucleus. B) Nitrogen. C) Elements. D) Electrons. Show Answer Correct Answer: C) Elements. 36. Atomic mass unit is equal to the: A) Mass of 1/12th of C-14 atom. B) Mass of 1/12th of C-13 atom. C) Mass of 1/12th of C-12 atom. D) None of the above. Show Answer Correct Answer: C) Mass of 1/12th of C-12 atom. 37. The value of Avogadro's number is A) 6.022 x 10$^{23}$. B) 6.022 x 10$^{22}$. C) 6.022 x 10$^{21}$. D) 6.023 x 10$^{22}$. Show Answer Correct Answer: A) 6.022 x 10$^{23}$. 38. Which of the following is a chemical formula? A) H$_{2}$SO$_{4}$. B) And. C) Hg. D) C. Show Answer Correct Answer: A) H$_{2}$SO$_{4}$. 39. Plasma exists in form of A) Both B and C. B) Ions. C) Free electrons. D) None. Show Answer Correct Answer: A) Both B and C. 40. The atomicity of K2Cr2O7 is A) 11. B) 10. C) 9. D) 10. Show Answer Correct Answer: A) 11. 41. States that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass A) Law of multiple proportions. B) Periodic table. C) Law of conservation of mass. D) Law of definite proportions. Show Answer Correct Answer: D) Law of definite proportions. 42. THE INDIVISIBILITY OF ATOM WAS PROPOSED A) PROUST. B) Lavoisier. C) DALTON. D) RUTERFORD. Show Answer Correct Answer: C) DALTON. 43. What is the main function of phloem in plants? A) Ascent of sap. B) Transport of food. C) Photosynthesis. D) Conduction water. Show Answer Correct Answer: B) Transport of food. 44. What is the volume of 5 moles of oxygen gas at room temperature? A) 112 cm$^{3}$. B) 120 L. C) 120 mL. D) 112 dm$^{3}$. Show Answer Correct Answer: B) 120 L. 45. How many elements occur naturally on Earth? A) 94. B) 75. C) 100. D) 118. Show Answer Correct Answer: A) 94. 46. Which of the following has highest number of protons? A) Aluminium. B) Carbon. C) Manganese. D) Hydrogen. Show Answer Correct Answer: C) Manganese. 47. Bill new compares atoms to A) Cubes. B) Letters of the alphabet. C) Space. D) Round objects. Show Answer Correct Answer: B) Letters of the alphabet. 48. ASSERTION:Water molecules always contain Hydrogen and Oxygen in the Ratio 1:8. REASON:Water obeys the law of i.e. proposed by dalton. A) A and R both are correct and R is correct explanation of A. B) A and R both are correct but R is not correct explanation of A. C) A is true but R is false. D) A is false but R is false. Show Answer Correct Answer: C) A is true but R is false. 49. Mole can be represented through ..... and ..... A) Mass and number of particles. B) Mass and atomic mass. C) Molecular mass and Atomic mass. D) None of the above. Show Answer Correct Answer: A) Mass and number of particles. 50. Which tissue provides mechanical strength along with hardness to the plants? A) Parenchyma. B) Aerenchyma. C) Sclerenchyma. D) Collenchyma. Show Answer Correct Answer: C) Sclerenchyma. 51. Which substance does the cell wall in the husk of a coconut possess? A) Cutin. B) Pectin. C) Suberin. D) Lignin. Show Answer Correct Answer: D) Lignin. 52. Who laid the foundation of chemical services by establishing 2 important laws of chemical combination? A) Antoine Lavoisier. B) Democritus. C) Dalton. D) Avagadro. Show Answer Correct Answer: A) Antoine Lavoisier. 53. When you heat matter, what happens to the atoms and molecules? A) They stop moving. B) They stay the same. C) They move faster. D) They move slower. Show Answer Correct Answer: C) They move faster. 54. The chemical formula of Aluminium Sulphate is: A) At $ _ {2} $ (so $ _ {4} $) $ _ {3} $. B) Al (so $ _ {4} $) $ _ {2} $. C) AlSO$_{4}$. D) At $ _ {3} $ (so $ _ {4} $) $ _ {2} $. Show Answer Correct Answer: A) At $ _ {2} $ (so $ _ {4} $) $ _ {3} $. 55. Who gave the name "atom" A) Avagadro. B) Democritus. C) Neil Bohr. D) Rutherford. Show Answer Correct Answer: B) Democritus. 56. One gram atom of oxygen is equal to A) 2g. B) 16g. C) 12g. D) None. Show Answer Correct Answer: B) 16g. 57. Hydrargyrum is the Latin name of ..... A) Mercury. B) Tungsten. C) Iron. D) Tin. Show Answer Correct Answer: A) Mercury. 58. How many moles are 98.3 grams of aluminum hydroxide, Al(OH)$_{3}$? (Atomic mass of Al = 27, H= 1, O = 16) A) 0.8 moles. B) 150 moles. C) 1.26 moles. D) 7, 673.4 moles. Show Answer Correct Answer: C) 1.26 moles. 59. How many times an atom of sulphur is heavier than an atom of carbon? A) 12 times. B) 8/3 times. C) 2 times. D) 32 times. Show Answer Correct Answer: B) 8/3 times. 60. "Total mass of the products formed in chemical reaction is exactly equal to the total mass of the reactants present in it." is a ..... A) Law of constant proportion. B) Law of multiple proportion. C) Law of conservation of mass. D) All the above. Show Answer Correct Answer: C) Law of conservation of 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 3Class 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