This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 19 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The number of outermost electrons in the outermost shell are called A) Valency. B) Valence electron. C) Nhi pta bhayi. D) Shayad a and b. Show Answer Correct Answer: B) Valence electron. 2. Who discovered the presence of new radiation in gas discharge and called them canal rage? A) J.J Thomson. B) E. Gold-stein. C) All the above. D) None of the above. Show Answer Correct Answer: B) E. Gold-stein. 3. Bohr model's key success lay in what? A) Explaining the rydberg formula. B) Cubic model. C) Plum pudding model. D) None of the above. Show Answer Correct Answer: A) Explaining the rydberg formula. 4. The atomic number of an element having the maximum number of unpaired electrons in p-subshell is A) 12. B) 7. C) 16. D) 10. Show Answer Correct Answer: B) 7. 5. What is mass number? A) Number of protons. B) Number of electrons. C) Number of protons and electrons. D) Number of protons and neutrons. Show Answer Correct Answer: D) Number of protons and neutrons. 6. Which particle tells you the identity of the element? A) Protons. B) Neutrons. C) Nucleus. D) Electrons. Show Answer Correct Answer: A) Protons. 7. If X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. $^{77}$$_{35}$X II. $^{77}$$_{33}$X III. $^{81}$$_{37}$X IV. $^{81}$$_{35}$$^{ }$X A) I and II. B) III and IV. C) I and IV. D) I and III. Show Answer Correct Answer: C) I and IV. 8. The correct electronic configuration of potassium is ..... ? A) 2, 8, 8, 18. B) 2, 8, 4. C) 2, 8, 8, 1. D) 2, 8, 8, 6. Show Answer Correct Answer: C) 2, 8, 8, 1. 9. What is The branch of science that takes intoaccount this dual behaviour of matter called? A) Spectrometry. B) Quantum mechanics. C) Chemistry. D) Classical mechanics. Show Answer Correct Answer: B) Quantum mechanics. 10. He unknowingly discovered the electron as a result of cathode ray tube experiments. A) Democritus. B) Thomson. C) Aristotle. D) Chadwick. Show Answer Correct Answer: B) Thomson. 11. How many Valance electrons does Iodine Have? A) 6. B) 7. C) 17. D) 16. Show Answer Correct Answer: B) 7. 12. 6-The number of orbitals in the fourth energy level is A) 4. B) 9. C) 16. D) 32. Show Answer Correct Answer: C) 16. 13. What did Ernest Rutherford's experiment prove wrong? A) The solid sphere model. B) The orbital model. C) The plum pudding model. D) The atomic theory. Show Answer Correct Answer: C) The plum pudding model. 14. In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron as A) -2. B) -1/2. C) 1/2. D) 2. Show Answer Correct Answer: B) -1/2. 15. What is in the center of an atom? A) Nucleus. B) Cell. C) Structure. D) Way. Show Answer Correct Answer: A) Nucleus. 16. Electronic configuration of cu(29) is A) 3d10 4s1. B) 3d11 4s2. C) 3d8 4s2. D) 3d9 4s2. Show Answer Correct Answer: A) 3d10 4s1. 17. What is the small central core of an atom called? A) Nucleus. B) Orbital. C) Core. D) Electron. Show Answer Correct Answer: A) Nucleus. 18. Identify the sub-shell with highest energy. A) 4f. B) 4d. C) 5p. D) 5s. Show Answer Correct Answer: A) 4f. 19. $_{64}$Gd has the configuration A) [Xe]4f$^{7}$ 5d$^{1}$ 6s$^{2}$. B) [Xe]4f$^{8 }$6s$^{2}$. C) [Xe]4f$^{10}$. D) [Xe]4f$^{5}$ 5d$^{3}$ 6s$^{2}$. Show Answer Correct Answer: A) [Xe]4f$^{7}$ 5d$^{1}$ 6s$^{2}$. 20. True or false:All neutral atoms have equal numbers of protons and electrons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 21. What are the valences possible if there are 15 electrons in an element? A) 3. B) 5. C) Both 3 and 5. D) 8. Show Answer Correct Answer: C) Both 3 and 5. 22. If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is: A) 1. B) 4. C) 2. D) 3. Show Answer Correct Answer: A) 1. 23. The discovery of an electron by A) Millikan. B) Rutherford. C) Perrin. D) J.J Thomson. Show Answer Correct Answer: D) J.J Thomson. 24. Uncertainity in the position of an electron (mass= 9.1 x 10$^{-31}$ kg) moving with a velocity 300 m/s, accurate upto 0.001% will be A) 5.76 x 10$^{-2}$ m. B) 1.92 x 10$^{-2}$ m. C) 19.2 x 10$^{-2}$ m. D) 3.84 x 10$^{-2}$ m. Show Answer Correct Answer: B) 1.92 x 10$^{-2}$ m. 25. Which orbital shows maximum shielding effect? A) S. B) P. C) F. D) D. Show Answer Correct Answer: A) S. 26. Most of the mass of an atom is: A) In the electrons. B) In the empty space. C) In the energy levels. D) In the nucleus. Show Answer Correct Answer: D) In the nucleus. 27. The energy of electron in the first Bohr orbit of H atom is-13.6 eV. The possible energy value (s) of the excited state(s) for electron in Bohr orbitals of hydrogen is (are) A) -3.4 eV. B) +3.4 eV. C) -6.8 eV. D) All of these. Show Answer Correct Answer: A) -3.4 eV. 28. What did the cathode-ray tube experiment prove? A) Atoms could be broken into smaller parts. B) Atoms caused the changes in matter. C) Atoms join to create compounds. D) The center of an atom has a nucleus. Show Answer Correct Answer: A) Atoms could be broken into smaller parts. 29. The two electrons occupying the same orbital are distinguished by A) Spin Quantum Number. B) Principal Quantum Number. C) Azimuthal Quantum Number. D) Magnetic Quantum Number. Show Answer Correct Answer: A) Spin Quantum Number. 30. When did J.J. Thomson run his cathode-ray tube experiment? A) 1801. B) 1897. C) 1810. D) 460 BCE. Show Answer Correct Answer: B) 1897. 31. The scientist responsible for "discovering" the nucleus is: A) Bohr. B) Rutherford. C) Schroedinger. D) Einstein. Show Answer Correct Answer: B) Rutherford. 32. C is the chemical symbol for the element ..... A) Carbon. B) Cobalt. C) Calcium. D) Chlorine. Show Answer Correct Answer: A) Carbon. 33. Which of the following lists the electromagnetic waves in order of increasing wavelength? A) X-rays, visible light, radio waves. B) Gamma rays, microwaves, UV rays. C) Infrared rays, radio waves, x-rays. D) None of the above. Show Answer Correct Answer: A) X-rays, visible light, radio waves. 34. Which isotope is used in the nuclear power plants to generate electricity? A) Iodine 131. B) Uranium 238. C) Cobalt 60. D) Uranium 235. Show Answer Correct Answer: D) Uranium 235. 35. Atoms with different mass number and atomic numbers but have the same number of neutrons in the nucleus is A) Isobar. B) Isotone. C) Isotope. D) Isomer. Show Answer Correct Answer: B) Isotone. 36. The chargeless particles in an atom are A) Protons. B) Electrons. C) Neutrons. D) Protons and electrons. Show Answer Correct Answer: C) Neutrons. 37. Orbital that is not possible A) 2d. B) 5f. C) 4p. D) 3s. Show Answer Correct Answer: A) 2d. 38. Model of the atom where electrons orbit the nucleus in energy levels A) Rutherford. B) Dalton. C) Thomson. D) Bohr. Show Answer Correct Answer: D) Bohr. 39. The atomic particle with a positive charge is the ..... A) Proton. B) Neutron. C) Nucleus. D) Electron. Show Answer Correct Answer: A) Proton. 40. What is the number of neutrons in phosphorus-31? A) 15. B) 46. C) 31. D) 16. Show Answer Correct Answer: D) 16. 41. What is a valence electron? A) Electrons in the first energy shell. B) Electrons in the outer shell. C) Total number of electrons. D) Electrons in the second energy shell. Show Answer Correct Answer: B) Electrons in the outer shell. 42. There are two species represented as $^{35}$Cl and $^{37}$Cl. Which of the following statement is correct regardingthese species? A) They have different chemical properties. B) They have the same number of protons. C) They are isobars of the same element. D) Their physical properties are the same. Show Answer Correct Answer: B) They have the same number of protons. 43. Atoms of which two elements have a combined total of 23 protons? A) Sodium, Na, and magnesium, Mg. B) Boron, B, and carbon, C. C) Copper, Cu, and zinc, Zn. D) None of these. Show Answer Correct Answer: A) Sodium, Na, and magnesium, Mg. 44. This subatomic particle is located in the electron cloud. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: C) Electron. 45. What is the main difference between isotopes of the same element? A) Number of neutrons. B) Number of electrons. C) Atomic number. D) Number of protons. Show Answer Correct Answer: A) Number of neutrons. 46. Rutherford's atomic model suggests the existence of A) Nucleus. B) Mesons. C) Atom. D) $\alpha$-particle. Show Answer Correct Answer: A) Nucleus. 47. A sub-atomic particle with a postive charge A) Electron. B) Neutron. C) Nucleus. D) Proton. Show Answer Correct Answer: D) Proton. 48. A scientist performs tests on a sample of an element. The element is a shiny solid that conducts electricity and heat. The scientist is able to bend and flatten the sample whenpressure is applied to it.Based on this information, the element could NOT be a member of which group on theperiodic table? A) Group 18. B) Group 12. C) Group 2. D) Group 8. Show Answer Correct Answer: A) Group 18. 49. The radius of the second Bohr orbit for hydrogen atom is A) 4.76 Angstrom. B) 0.529 Angstrom. C) 2.12 Angstrom. D) 1.65 Angstrom. Show Answer Correct Answer: C) 2.12 Angstrom. 50. Where is the proton located? A) Nucleus. B) The outside of an atom. C) Energy shells. D) Electron cloud. Show Answer Correct Answer: A) Nucleus. 51. What was the source of alpha particles in the Rutherford scattering experiment? A) Hydrogen nucleus. B) Argon nucleus. C) Helium nucleus. D) None of these. Show Answer Correct Answer: C) Helium nucleus. 52. The maximum number of electrons in s, p and d-subshells are A) 2 in each. B) 2, 4 and 6. C) 2, 6 and 10. D) 2, 6 and 12. Show Answer Correct Answer: C) 2, 6 and 10. 53. What is the energy of light whose wavelength is 4.06 x 10$^{-11}$ m? A) 2.69 x 10$^{-44}$ J. B) 1.63 x 10$^{-23}$$^{}$ J. C) 8.97 x 10$^{-53 J}$. D) 4.90 x 10$^{-15}$ J. Show Answer Correct Answer: D) 4.90 x 10$^{-15}$ J. 54. Which set is correct A) N =1 l=1 m=0. B) N=5 l=2 m=0. C) N=2 l=0 m=1. D) N=3 l=-2 m=0. Show Answer Correct Answer: B) N=5 l=2 m=0. 55. How do you identify an element? A) By matching the number of protons to the atomic number. B) By matching the number of neutrons to the atomic number. C) By matching the number of electrons to the atomic number. D) None of the above. Show Answer Correct Answer: A) By matching the number of protons to the atomic number. 56. Mass number = ..... A) Number of protons + number of neutrons. B) Number of electrons + number of neutrons. C) Number of protons + number of electrons. D) Number of neutrons. Show Answer Correct Answer: A) Number of protons + number of neutrons. 57. For which of the following sets of quantum numbers an electron will have the highest energy? A) 3, 2, 1, 1/2. B) 5, 1, 0, -1/2. C) 5, 0, 0, 1/2. D) 4, 2, -1, 1/2. Show Answer Correct Answer: B) 5, 1, 0, -1/2. 58. The symbol for CHLORINE is ..... A) Cn. B) Cl. C) Ch. D) C. Show Answer Correct Answer: B) Cl. 59. Assertion:There are 5 electrons in the 3d sub-shell of Cr.Reason:Half-filled sub-shells are more stable. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: A) Both A and R are true and R is the correct explanation of A. 60. The charge of an atom is determined by the- A) Shape of the electron cloud. B) Atomic mass of the element. C) Radius of the outermost electron. D) Number of protons and electrons. Show Answer Correct Answer: D) Number of protons and electrons. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 1Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 2Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 3Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 4Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 5Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 6Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 7Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books