This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The atomic numbers of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element whichcannot form a cation is: A) A. B) B. C) C. D) D. Show Answer Correct Answer: C) C. 2. In order for an atom to be neutral what has to be true? A) The atom has more protons than neutrons. B) The atom has more neutrons than protons. C) The atom has the same number of protons and neutrons. D) The atom has the same number of protons and electrons. Show Answer Correct Answer: D) The atom has the same number of protons and electrons. 3. An element is defined by its number of A) Protons. B) Electrons. C) Neutrons. D) Protons + electrons. Show Answer Correct Answer: A) Protons. 4. What are the possible values of four quantum numbers (n, l, m, s) for an electron in 4f orbital. A) 4, 2, 2, +1/2. B) 4, 3, 2, +1/2. C) 5, 3, 2, -1/2. D) 3, 3, 1, +1/2. Show Answer Correct Answer: B) 4, 3, 2, +1/2. 5. $_{19}$K$^{39}$ and $_{20}$Ca$^{40 }$are: A) Isotopes. B) Isobars. C) Isotones. D) Isomers. Show Answer Correct Answer: C) Isotones. 6. An element has 16 protons and 32 nucleons in its nucleus, how many neutrons are present in the atom? A) 8. B) 16. C) 18. D) 48. Show Answer Correct Answer: B) 16. 7. An atom becomes negatively charged by A) Gaining an electron. B) Losing an electron. C) Losing a proton. D) Gaining a neutron. Show Answer Correct Answer: A) Gaining an electron. 8. Breaking of water molecules to get its constituent elements by passing electric current through it, is called A) Combination reaction. B) Decomposition reaction. C) Neutralization. D) None of the above. Show Answer Correct Answer: B) Decomposition reaction. 9. Which is transition element A) Ca. B) Xe. C) P. D) Ti. Show Answer Correct Answer: D) Ti. 10. Boron and Nitrogen have same valency? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. 9-An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is A) Cu. B) Fe. C) Cr. D) Ti. Show Answer Correct Answer: C) Cr. 12. What is the difference in the number of electrons in an atom of silicon (Si) and an atom of iodine (I)? A) 67. B) 39. C) 98. D) 98.815. Show Answer Correct Answer: B) 39. 13. Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order(i) Rutherford's atomic model(ii) Thomson's atomic model(ii) Bohr's atomic model A) (i), (ii) and (iii). B) (ii), (iii) and (i). C) (ii), (i) and (iii). D) (iii), (ii) and (i). Show Answer Correct Answer: C) (ii), (i) and (iii). 14. Atoms having the same mass number but different atomic numbers are called? A) Isotone. B) Isoprene. C) Isobar. D) Isotope. Show Answer Correct Answer: C) Isobar. 15. Which of the following pairs of sub-atomic particles are inside the nucleus of the atom? A) Protons and Electrons. B) Electrons and Neutrons. C) Protons and Nucleus. D) Protons and Neutrons. Show Answer Correct Answer: D) Protons and Neutrons. 16. He found that atoms have smaller parts and found negative electrons that he theorized were surrounded in a sphere of positive charges A) J.J. Thomson. B) Ernest Rutherford. C) Niels Bohr. D) James Chadwick. Show Answer Correct Answer: A) J.J. Thomson. 17. The electronic configuration of Cl is (Atomic number-17) A) 2, 8. B) 2, 8, 8. C) 2, 8, 7. D) 2, 8, 1. Show Answer Correct Answer: C) 2, 8, 7. 18. This subatomic particle is found outside the nucleus. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: C) Electron. 19. Two atoms of the same element but with different mass numbers are called ..... A) Electrons. B) Isotopes. C) Variables. D) Electron cloud. Show Answer Correct Answer: B) Isotopes. 20. The least energy shell is? A) K. B) L. C) M. D) N. Show Answer Correct Answer: A) K. 21. Which subatomic particle determines the identity of the atom? A) Proton. B) Neutron. C) Electron. D) All of them are important for the identity. Show Answer Correct Answer: A) Proton. 22. What does the nucleus of an atom contain? A) Electrons and neutrons. B) Protons and neutrons. C) Electrons and protons. D) Neutrons and electrons. Show Answer Correct Answer: B) Protons and neutrons. 23. ELECTRONS REVOLVE IN DISCRETE ENERGY SHELLSTHIS WAS PROPOSED BY A) NEIL BOHR. B) ANTOINNE LAVOISIER. C) ROBERT BOYLE. D) RUTHERFORD. Show Answer Correct Answer: A) NEIL BOHR. 24. An atom of a certain element has 14 protons, 14 electrons, and a mass number of 27. At room temperature it serves as an excellent semiconductor. How many neutrons are in this atom? A) 28. B) 14. C) 27. D) 13. Show Answer Correct Answer: D) 13. 25. Which of these particles was discovered first? A) Protons. B) Electrons. C) Neutrons. D) Quarks. Show Answer Correct Answer: B) Electrons. ← PreviousNext →Related 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 8Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 9Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books