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 18 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 18 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. To which group does Arsenic belong A) 13. B) 14. C) 16. D) 15. Show Answer Correct Answer: D) 15. 2. This subatomic particle has a neutral charge. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: B) Neutron. 3. DIFFERENT kinds of atoms chemically combined to form a substance are A) Mixture. B) Element. C) Compound. D) Substance. Show Answer Correct Answer: C) Compound. 4. In the nucleus of $^{40}$$_{20}$Ca, there are A) 40 protons and 20 electrons. B) 20 protons and 40 electrons. C) 20 protons and 20 neutrons. D) 20 protons and 40 neutrons. Show Answer Correct Answer: C) 20 protons and 20 neutrons. 5. The scientist known as the Father of Electricity is A) Sir Humphry Davy. B) John Dalton. C) Michael Faraday. D) Ernest Rutherford. Show Answer Correct Answer: C) Michael Faraday. 6. WHO DISCOVERED ELECTRONS A) J.J.THOMSON. B) E.GOLDSTEIN. C) RUTHERFORD. D) CHADWIK. Show Answer Correct Answer: A) J.J.THOMSON. 7. Assertion:All elements have extra neutrons in themReason:Extra neutrons increase nuclear attraction force A) Both A nd R-True. B) Both A and R-False. C) A is true, R is false. D) A is false, R is true. Show Answer Correct Answer: D) A is false, R is true. 8. For each metal, there is a characteristic minimum frequency, below which photoelectric effect is not observed. This is called A) Threshold frequency. B) Work function. C) Bohr frequency. D) Initial frequency. Show Answer Correct Answer: A) Threshold frequency. 9. If an electron is moving with a velocity 600m/sec which is accurate upto 0.005%, then calculate the uncertainty in its position. A) 3X10$^{-8}$m. B) 5.67X10$^{-2}$ m. C) 1.93X10$^{-3}$ m. D) 3X10$^{-2}$ m. Show Answer Correct Answer: C) 1.93X10$^{-3}$ m. 10. An orbital can at most hold how many electrons? A) 1 electron. B) 3 electrons. C) 4 electrons. D) 2 electrons. Show Answer Correct Answer: D) 2 electrons. 11. If an atom has 12 protons, 13 neutrons, and 12 electrons, what is the charge of the nucleus? A) -13. B) -12. C) +13. D) +12. Show Answer Correct Answer: D) +12. 12. What is the mass of proton used for practical purposes? A) 0. B) 2u. C) 1u. D) 3u. Show Answer Correct Answer: C) 1u. 13. Electronic configuration of Sodium is ( Shells )? A) 2, 1, 8. B) 2, 8. C) 1, 2, 8. D) 2, 8, 1. Show Answer Correct Answer: D) 2, 8, 1. 14. In the atomic spectrum of hydrogen, the spectral lines pertaining to electronic transition of n = 4 to n = 2 refers to A) Paschen lines. B) Balmer lines. C) Brackett lines. D) Lyman lines. Show Answer Correct Answer: B) Balmer lines. 15. How many quantum numbers are needed to describe the energy state of an electron in an atom? A) 3. B) 2. C) 4. D) 1. Show Answer Correct Answer: C) 4. 16. What causes the photoelectric effect according to Einstein? A) Lattice vibrations. B) Photons knock out electrons. C) Radiation pressure. D) Electrons absorb energy. Show Answer Correct Answer: B) Photons knock out electrons. 17. This subatomic particle contributes to the charge and the mass of an atom. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: A) Proton. 18. What is the central part of an atom called? A) Neutron. B) Nucleus. C) Electron cloud. D) Proton. Show Answer Correct Answer: B) Nucleus. 19. 1s & 2s orbitals have similar A) Shape. B) Radius. C) Size. D) Energy. Show Answer Correct Answer: A) Shape. 20. Total number of orbitals present in a given energy level with principal quantum number n = 3 is A) 12. B) 9. C) 3. D) 18. Show Answer Correct Answer: B) 9. 21. Contributes basically no mass to an atom. A) Protons. B) Neutrons. C) Electrons. D) Protons and neutrons. Show Answer Correct Answer: C) Electrons. 22. Which particle has a positive electrical charge? A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: A) Proton. 23. Which of the following lists the two subatomic particles that contribute the most to the mass of an atom? A) Protons and electrons. B) Protons and neutrons. C) Neutrons and electrons. D) Electrons and ions. Show Answer Correct Answer: B) Protons and neutrons. 24. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?(a) 13(b) 10(c) 14(d) 16 A) D. B) C. C) A. D) B. Show Answer Correct Answer: D) B. 25. Which of the following statements regarding the hydrogen atom spectrum is not correct A) The single electron in hydrogen jumps to higher energy levels. B) The energy of an electron in a hydrogen atom is quantised. C) Hydrogen is the only element that can produce an atomic spectrum. D) When an electron has the smallest allowable amount of energy, it is in the ground state. Show Answer Correct Answer: C) Hydrogen is the only element that can produce an atomic spectrum. 26. The term degenerate means A) Equal energy of orbitals of same subshell. B) Equal energy of subshells of same shell. C) Unequal energy of subshells of same shell. D) Unequal energy of orbitals in same subshell. Show Answer Correct Answer: A) Equal energy of orbitals of same subshell. 27. A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: B) FALSE. 28. Na is the symbol for ..... A) Neon. B) Helium. C) Sodium. D) Sulfur. Show Answer Correct Answer: C) Sodium. 29. The credit for the discovery for Protons is given to? A) Eugen Goldstein. B) Neils Bohr. C) Ernest Rutherford. D) Michael Faraday. Show Answer Correct Answer: A) Eugen Goldstein. 30. Isobars do not differ in the number of(a) protons(b) electrons(c) neutrons(d) nucleons A) D. B) A. C) B. D) C. Show Answer Correct Answer: A) D. 31. The ..... waves do not require medium to travel. A) Electromagnetic waves. B) Sound waves. C) Heat waves. D) Water waves. Show Answer Correct Answer: A) Electromagnetic waves. 32. K is the symbol for ..... A) Phosphorus. B) Potassium. C) Calcium. D) Carbon. Show Answer Correct Answer: B) Potassium. 33. Neutron was discovered by A) James Chadwick, 1932. B) J.J Thomson, 1897. C) E. Goldstein, 1888. D) None of the above. Show Answer Correct Answer: A) James Chadwick, 1932. 34. Value of l (azimuthal quantum number) for d subshell is A) 3. B) 2. C) 0. D) 1. Show Answer Correct Answer: B) 2. 35. Sodium (Na) and potassium (K) are in the same group on the periodic table. Based on their locations, which statement about sodium and potassium is true? A) Sodium is less electronegative than potassium. B) Sodium has fewer energy levels than potassium. C) Sodium has lower ionization energy than potassium. D) Sodium has a larger ionic radius than potassium. Show Answer Correct Answer: B) Sodium has fewer energy levels than potassium. 36. What is the positively charged region at the center of an atom called? A) Proton. B) Nucleus. C) Mass. D) Atom. Show Answer Correct Answer: B) Nucleus. 37. Number of electrons in one Orbital A) 10. B) 14. C) 6. D) 2. Show Answer Correct Answer: D) 2. 38. The conclusion that every additional electron enters the orbital with lowest possible energy has been drawn from A) Aufbau principle. B) De-Broglie's equation. C) Hund's rule. D) Pauli's exclusion principle. Show Answer Correct Answer: A) Aufbau principle. 39. According to dalton atom is A) Divisible. B) Indivisible. C) All the above. D) None of the above. Show Answer Correct Answer: B) Indivisible. 40. What is the primary reason for the stability of an atom according to Rutherford's model? A) Neutrons provide stability. B) Electrostatic forces between nucleus and electrons. C) Electrons are in fixed orbits. D) Electrons are stationary. Show Answer Correct Answer: B) Electrostatic forces between nucleus and electrons. 41. Deutrium is used to make A) Light water. B) Soft water. C) Hard water. D) Heavy water. Show Answer Correct Answer: D) Heavy water. 42. No. of radial, angular, total nodes for 4f subshell A) 0, 3, 3. B) 4, 3, 7. C) 3, 0, 3. D) 3, 4, 7. Show Answer Correct Answer: A) 0, 3, 3. 43. How many shells does an atom have? A) 4. B) 2. C) 3. D) 8. Show Answer Correct Answer: A) 4. 44. Which isotope of an element is used in the treatment of goitre? A) Oxygen. B) Carbon. C) Iodine. D) Hydrogen. Show Answer Correct Answer: C) Iodine. 45. The isotope Deuterium has A) No neutrons and one proton. B) One neutrons and two protons. C) One electron and two neutron. D) One proton and one neutron. Show Answer Correct Answer: D) One proton and one neutron. 46. If the atomic number of an element is 12. Predict the valency of this element. Is it a metal or a non-metal? A) 6, Metal. B) 6, Non-metal. C) 2, Metal. D) 2, Non-metal. Show Answer Correct Answer: C) 2, Metal. 47. Dalton's atomic theory successfully explained(i) Law of conservation of mass(ii) Law of constant composition(iii) Law of radioactivity(iv) Law of multiple proportion A) (i), (ii) and (iii). B) (i), (iii) and (iv). C) (ii), (iii) and (iv). D) (i), (ii) and (iv). Show Answer Correct Answer: D) (i), (ii) and (iv). 48. What are defined as atoms having the same mass number but different atomic numbers? A) Isobar. B) Isotope. C) Isotone. D) Isomer. Show Answer Correct Answer: A) Isobar. 49. Where is an atom's electron cloud located? A) Inside the nucleus. B) Outside of the atom. C) Surrounding the nucleus. D) None of the above. Show Answer Correct Answer: C) Surrounding the nucleus. 50. Na$^{+}$ has 12 neutrons and 10 electrons. Which of the following statement is correct? A) Na$^{+}$ has atomic number equal to 10 and mass number 22. B) Na$^{+}$ has atomic number equal to 11 and mass number 23. C) Na$^{+}$ has atomic number equal to 10 and mass number 23. D) Na$^{+}$ has atomic number equal to 11 and mass number 22. Show Answer Correct Answer: B) Na$^{+}$ has atomic number equal to 11 and mass number 23. 51. An atom of silicon has 14 protons and 15 neutrons. What is the mass number of this atom of silicon? A) 28.085. B) 15. C) 29. D) 14. Show Answer Correct Answer: C) 29. 52. Which of the subatomic particles is the lightest A) All have the same mass. B) Protons. C) Neutrons. D) Electrons. Show Answer Correct Answer: D) Electrons. 53. Who performed the famous 'gold foil experiment'? A) Bohr. B) Thomson. C) Dalton. D) Rutherford. Show Answer Correct Answer: D) Rutherford. 54. "C" is the element symbol for which element? A) Carbon. B) Calcium. C) Cadmium. D) Chlorine. Show Answer Correct Answer: A) Carbon. 55. Which of the following elements has the same number of protons, electrons and neutrons A) Mg. B) P. C) Cl. D) Al. Show Answer Correct Answer: A) Mg. 56. Alpha particle has charge of A) 1-. B) 1+. C) 2-. D) 2+. Show Answer Correct Answer: D) 2+. 57. The electron configuration of an atom is 1s$^{2}$2s$^{2}$2p$^{6}$. The number of valence electrons in the atom is A) 6. B) 3. C) 8. D) 10. Show Answer Correct Answer: C) 8. 58. Protons, Neutrons & Electrons are examples of A) Subatomic particles. B) Valence electrons. C) Elements. D) None of the above. Show Answer Correct Answer: A) Subatomic particles. 59. Calculate total number of lines in emission spectrum if electron jumps from n=5 A) 4. B) 15. C) Infinite. D) 10. Show Answer Correct Answer: D) 10. 60. Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element whichcannot form an anion is most likely to be: A) W. B) Y. C) Z. D) X. Show Answer Correct Answer: D) X. ← 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