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 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 7 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Rutherford's alpha particle scattering experiment led to the discovery of: A) Protons. B) Neutrons. C) Nucleus. D) Electrons. Show Answer Correct Answer: C) Nucleus. 2. How many subshell are associated with n=4 A) 5. B) 2. C) 4. D) 3. Show Answer Correct Answer: C) 4. 3. Isotopes of an element have a different number of ..... A) Neutrons. B) Mass. C) Protons. D) Electrons. Show Answer Correct Answer: A) Neutrons. 4. The electronic configuration of silver atom in ground state is A) [Kr]3d104s1. B) [Xe]4f14 5d10 6s1. C) [Kr]4d9 5s2. D) [Kr]4d10 5s1. Show Answer Correct Answer: D) [Kr]4d10 5s1. 5. What are electrons? A) An atom's central regions, which is made up of protons and neutrons. B) Subatomic particles that have negative charges. C) Subatomic particles that have neutral charges. D) Subatomic particles that have positive charges. Show Answer Correct Answer: B) Subatomic particles that have negative charges. 6. E$^{2+}$ has an electron arrangement of 2.8. how many proton does E$^{2+}$ have? A) 12. B) 2. C) 8. D) 10. Show Answer Correct Answer: A) 12. 7. Which experiment led to the discovery of the nucleus? A) Oil drop experiment. B) Double-slit experiment. C) Cathode ray experiment. D) Gold foil experiment. Show Answer Correct Answer: D) Gold foil experiment. 8. In which of the following model of the atom, the positive charge and mass is thought to be uniformly distributed across the atom. A) Thomson's Plum Pudding model. B) Rutherford's nuclear model. C) Bohr's atomic model. D) Dalton's atomic model. Show Answer Correct Answer: A) Thomson's Plum Pudding model. 9. The nucleons are A) I. Protons and electrons e. B) II. Neutrons and electrons I. C) II. Protons and neutrons. D) IV. None of thes. Show Answer Correct Answer: C) II. Protons and neutrons. 10. Charge and mass of electron- A) -1.6 X10$^{-19}$ C and 9.1 X10$^{-27 }$kg. B) 1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. C) -1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. D) 1.6 X10$^{-19}$ C and 9.1 X10$^{-27 }$kg. Show Answer Correct Answer: C) -1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. 11. Which of the following is a statement of Planck's quantum theory? A) Radiant energy can be absorbed or emitted in fixed amounts only. B) Electronic transition is accompanied by the emission of electromagnetic radiations. C) An orbital can accommodate a maximum of two electrons of opposite spins only. D) Electrons can be excited to higher energy levels by absorbing extra energy. Show Answer Correct Answer: A) Radiant energy can be absorbed or emitted in fixed amounts only. 12. Rutherford's alpha scattering experiment not concluded that at center of an atom nucleus is present. True or false A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 13. What is the smallest piece of an element that still represents that element? A) Neutron. B) Atom. C) Mass. D) Proton. Show Answer Correct Answer: B) Atom. 14. Isotopes are atoms of the same element with different #'s of ..... & therefore different ..... A) Neutrons ; mass number. B) Electrons ; mass numbers. C) Neutrons ; atomic numbers. D) Protons ; atomic numbers. Show Answer Correct Answer: A) Neutrons ; mass number. 15. For the electrons of oxygen atom, which of the following statements is correct? A) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite spin. B) Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital. C) Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital. D) An electron in the 2s orbital has the same energy as an electron in the 2p orbital. Show Answer Correct Answer: A) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite spin. 16. Isotopes are atoms of the same element that have the same number of ..... but different number of ..... Therefore, isotopes of the same element have different masses. A) Protons, electrons. B) Protons, neutrons. C) Electrons, protons. D) Neutrons, protons. Show Answer Correct Answer: B) Protons, neutrons. 17. What discovery did James Chadwick make? A) Neutrons. B) Nucleus. C) Electrons. D) Protons. Show Answer Correct Answer: A) Neutrons. 18. A balloon is rubbed on someone's head. If the balloon now has a negative charge it must have- A) Lost protons. B) Gained protons. C) Lose electrons. D) Gained electrons. Show Answer Correct Answer: D) Gained electrons. 19. Electrons that have not been excited are said to be at: A) Base line. B) High level. C) Set state. D) Ground state. Show Answer Correct Answer: D) Ground state. 20. When a plastic comb is rubbed with dry hair, then what happens? A) Electrons get transferred to the comb due to friction. B) Static charge builds up. C) The comb can now attract tiny pieces of paper. D) All of these. Show Answer Correct Answer: A) Electrons get transferred to the comb due to friction. 21. Which scientist gave the concept of fixed energy levels around the nucleus? A) Ernest Rutherford. B) Neils Bohr. C) J.J.Thomsan. D) None of these. Show Answer Correct Answer: B) Neils Bohr. 22. State the number of unpaired electrons present in Cr A) 4. B) 5. C) 3. D) 6. Show Answer Correct Answer: D) 6. 23. It is the quantum number that describes the energy of an orbital and its atomic size. A) Azimuthal Quantum Number. B) Principal Quantum Number. C) Spin Quantum Number. D) Magnetic Quantum Number. Show Answer Correct Answer: B) Principal Quantum Number. 24. In a sample of ethyl ethanoate (CH$_{3}$COOC$_{2}$H$_{5}$) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it? A) One of the oxygen atoms has gained two neutrons. B) The two oxygen atoms are isobars. C) One of the oxygen atoms has gained electrons. D) The two oxygen atoms are isotopes. Show Answer Correct Answer: D) The two oxygen atoms are isotopes. 25. True or False:The nucleus is the smallest and the lightest part of an atom. A) True. B) False. C) Maybe. D) None of the above. Show Answer Correct Answer: B) False. 26. Bohr atomic model can explain A) The spectrum of hydrogen molecule. B) The solar spectrum. C) The spectrum of hydrogen atom only. D) Spectrum of an atom or ion containing one electron only. Show Answer Correct Answer: D) Spectrum of an atom or ion containing one electron only. 27. An atom of phosphorous has 15 electrons. What is the valency of phosphorous? A) 3. B) 1. C) 2. D) 5. Show Answer Correct Answer: A) 3. 28. The energy possessed by one mole of photons is called A) One electron volt. B) One einstein. C) One joule. D) One joule second. Show Answer Correct Answer: B) One einstein. 29. Has a mass of about 1/2000th the mass of a proton. (we say it has ZERO mass) A) Neutron. B) Electron cloud. C) Nucleus. D) Electron. Show Answer Correct Answer: D) Electron. 30. A chemist is identifying the elements found in a sample of pond water. What characteristic of an element's atoms always determines the identity of the element? A) Number of neutrons. B) Number of protons. C) Location of valence electrons. D) Number of valence electrons. Show Answer Correct Answer: B) Number of protons. 31. Existence of electron was shown by: A) Chadwick. B) E.goldstein. C) Roopak sir. D) JJ thomsmon. Show Answer Correct Answer: D) JJ thomsmon. 32. How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178? A) 72 protons, 178 neutrons, 106 electrons. B) 72 protons, 106 neutrons, 72 electrons. C) 178 protons, 250 neutrons, 72 electrons. D) 106 protons, 72 neutrons, 106 electrons. Show Answer Correct Answer: B) 72 protons, 106 neutrons, 72 electrons. 33. John Dalton proposed atomic theory in which year? A) 1807. B) 1707. C) 1806. D) 1907. Show Answer Correct Answer: A) 1807. 34. For waves in any medium, as the wavelength decreases, what happens to the frequency? A) It also decrease. B) It stays the same. C) It increases. D) None of the above. Show Answer Correct Answer: C) It increases. 35. C is the symbol for ..... / A) Carbon. B) Chlorine. C) Copper. D) Calcium. Show Answer Correct Answer: A) Carbon. 36. What experiment did J.J. Thomson run to develop his model of the atom? A) Gold-Foil Experiment. B) No experimentation was done. C) Definite Proportion Experiment. D) Cathode-Ray Tube Experiment. Show Answer Correct Answer: D) Cathode-Ray Tube Experiment. 37. Mass number is denoted by? A) A. B) Z. C) N. D) M. Show Answer Correct Answer: A) A. 38. What type of charge does a nucleus have? A) Neutral. B) No charge. C) Positive. D) Negative. Show Answer Correct Answer: C) Positive. 39. The symbol for LITHIUM is ..... A) Lm. B) L. C) Lu. D) Li. Show Answer Correct Answer: D) Li. 40. What is the electron configuration of a neutral atom of oxygen? A) $1s^2 2s^2 2p^2$. B) $1s^2 2s^2 2p^3$. C) $1s^2 2s^2 2p^4$. D) $1s^2 2s^2 2p^6$. Show Answer Correct Answer: C) $1s^2 2s^2 2p^4$. 41. What are the maximum number of electrons that go on the first 3 energy levels? A) 2, 8, 18. B) 4, 8, 12. C) 2, 4, 16. D) 3, 4, 6. Show Answer Correct Answer: A) 2, 8, 18. 42. The ion iso-electronic with CO$^{+ }$is A) N$_{2}$$^{-}$. B) O$_{2}$$^{-}$. C) N$_{2}$$^{+}$. D) None of the above. Show Answer Correct Answer: C) N$_{2}$$^{+}$. 43. Which transition emits maximum energy A) 1-4. B) 4-3. C) 3-2. D) 2-1. Show Answer Correct Answer: D) 2-1. 44. No two electrons in the same atom can have the same four quantum numbers. A) Aufbau principle. B) Hund's rule. C) Pauli exclusion principle. D) Noble gas notation. Show Answer Correct Answer: C) Pauli exclusion principle. 45. The series of lines present in the visible region of the hydrogen spectrum is A) Balmer. B) Paschen. C) Brackett. D) Lyman. Show Answer Correct Answer: A) Balmer. 46. Protium, deuterium, tritium are the isotopes of ..... A) Helium. B) Hydrogen. C) Carbon. D) None of the above. Show Answer Correct Answer: B) Hydrogen. 47. What is the smallest particle of an element that retains its chemical properties? A) Atom. B) Compound. C) Molecule. D) Ion. Show Answer Correct Answer: A) Atom. 48. What is the term for the outermost electrons in an atom? A) Valence electrons. B) Core electrons. C) Free electrons. D) Bound electrons. Show Answer Correct Answer: A) Valence electrons. 49. Which of the following is not true for isotope? A) They have the same chemical properties. B) They have the same atomic number. C) They have the same electronic configuration. D) They have the same mass number. Show Answer Correct Answer: D) They have the same mass number. 50. Goldstein's experiments which involved passing high voltage electricity through gases at very low pressureresulted in the discovery of A) Nucleus. B) Neutron. C) Electron. D) Proton. Show Answer Correct Answer: D) Proton. 51. If K, L, M N, shells of an atom are full. The total number of electrons in that atom are: A) 26. B) 42. C) 36. D) 60. Show Answer Correct Answer: D) 60. 52. 1) The water droplets are spherical in free fall due to A) Viscosity. B) Gravity. C) Surface tension. D) Inter molecular attraction. Show Answer Correct Answer: C) Surface tension. 53. The principal quantum number, n, represents the: A) Magnetic value. B) Suborbital value. C) Spin value. D) Energy level. Show Answer Correct Answer: D) Energy level. 54. Canal Rays travel from A) Anode to cathode. B) Cathode to anode. C) Remain stationary. D) None of the above. Show Answer Correct Answer: B) Cathode to anode. 55. The region surrounding the center of the atom that is mostly empty space A) Nucleus. B) Electron cloud. C) Isotope. D) Ion. Show Answer Correct Answer: B) Electron cloud. 56. A subatomic particle that orbits an atom's nucleus, has a negative charge, and has very little mass A) Electron. B) Neutron. C) Proton. D) Isotope. Show Answer Correct Answer: A) Electron. 57. Rutherford's planet-like structure was defective and unsatisfactory because A) Moving e-accelerate towards the nucleus. B) Continuous spectrum. C) The behaviour of electron remain unexplained. D) All Are Correct. Show Answer Correct Answer: D) All Are Correct. 58. Neutrons are found in ..... except ..... A) Everywhere, nucleus. B) Nucleus, kripton. C) Nucleus, hydrogen. D) Outer shells, kripton. Show Answer Correct Answer: C) Nucleus, hydrogen. 59. What did Rutherford's gold foil experiment demonstrate? A) Electrons are embedded in a positive sphere. B) Atoms have a dense nucleus. C) Atoms are indivisible. D) Atoms are made of protons and neutrons only. Show Answer Correct Answer: B) Atoms have a dense nucleus. 60. Rutherford's 'alpha ($\alpha$) particles scattering experiment' resulted in the discovery of(a) electron(b) proton(c) nucleus in the atom(d) atomic mass A) D. B) C. C) B. D) A. Show Answer Correct Answer: B) C. ← 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 8Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books