This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 17 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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 protons. B) Number of neutrons. C) Location of valence electrons. D) Number of valence electrons. Show Answer Correct Answer: A) Number of protons. 2. Existence of electron was shown by: A) JJ thomsmon. B) Chadwick. C) E.goldstein. D) Roopak sir. Show Answer Correct Answer: A) JJ thomsmon. 3. 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. 4. John Dalton proposed atomic theory in which year? A) 1907. B) 1807. C) 1806. D) 1707. Show Answer Correct Answer: B) 1807. 5. 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. 6. C is the symbol for ..... / A) Copper. B) Carbon. C) Calcium. D) Chlorine. Show Answer Correct Answer: B) Carbon. 7. What experiment did J.J. Thomson run to develop his model of the atom? A) Gold-Foil Experiment. B) Definite Proportion Experiment. C) Cathode-Ray Tube Experiment. D) No experimentation was done. Show Answer Correct Answer: C) Cathode-Ray Tube Experiment. 8. Mass number is denoted by? A) A. B) N. C) M. D) Z. Show Answer Correct Answer: A) A. 9. What type of charge does a nucleus have? A) Negative. B) Neutral. C) Positive. D) No charge. Show Answer Correct Answer: C) Positive. 10. The symbol for LITHIUM is ..... A) Lu. B) Lm. C) Li. D) L. Show Answer Correct Answer: C) Li. 11. An isotope of which element is used as a fuel in a nuclear reactors? A) COBALT. B) THORIUM. C) URANIUM. D) CERIUM. Show Answer Correct Answer: C) URANIUM. 12. What is the electron configuration of a neutral atom of oxygen? A) $1s^2 2s^2 2p^4$. B) $1s^2 2s^2 2p^6$. C) $1s^2 2s^2 2p^2$. D) $1s^2 2s^2 2p^3$. Show Answer Correct Answer: A) $1s^2 2s^2 2p^4$. 13. What are the maximum number of electrons that go on the first 3 energy levels? A) 2, 4, 16. B) 2, 8, 18. C) 4, 8, 12. D) 3, 4, 6. Show Answer Correct Answer: B) 2, 8, 18. 14. The ion iso-electronic with CO$^{+ }$is A) N$_{2}$$^{-}$. B) O$_{2}$$^{-}$. C) N$_{2}$$^{+}$. D) None of the above. Show Answer Correct Answer: C) N$_{2}$$^{+}$. 15. The total number of orbitals in a shell having principal quantum n is A) N$^{2}$. B) 2n$^{2}$. C) N$^{3}$. D) N+1. Show Answer Correct Answer: A) N$^{2}$. 16. Which transition emits maximum energy A) 2-1. B) 1-4. C) 4-3. D) 3-2. Show Answer Correct Answer: A) 2-1. 17. No two electrons in the same atom can have the same four quantum numbers. A) Aufbau principle. B) Pauli exclusion principle. C) Hund's rule. D) Noble gas notation. Show Answer Correct Answer: B) Pauli exclusion principle. 18. The series of lines present in the visible region of the hydrogen spectrum is A) Lyman. B) Balmer. C) Paschen. D) Brackett. Show Answer Correct Answer: B) Balmer. 19. Protium, deuterium, tritium are the isotopes of ..... A) Helium. B) Hydrogen. C) Carbon. D) None of the above. Show Answer Correct Answer: B) Hydrogen. 20. What is the smallest particle of an element that retains its chemical properties? A) Ion. B) Atom. C) Molecule. D) Compound. Show Answer Correct Answer: B) Atom. 21. What is the term for the outermost electrons in an atom? A) Core electrons. B) Valence electrons. C) Free electrons. D) Bound electrons. Show Answer Correct Answer: B) Valence electrons. 22. Which of the following is not true for isotope? A) They have the same atomic number. B) They have the same mass number. C) They have the same electronic configuration. D) They have the same chemical properties. Show Answer Correct Answer: B) They have the same mass number. 23. Goldstein's experiments which involved passing high voltage electricity through gases at very low pressureresulted in the discovery of A) Electron. B) Proton. C) Nucleus. D) Neutron. Show Answer Correct Answer: B) Proton. 24. If K, L, M N, shells of an atom are full. The total number of electrons in that atom are: A) 60. B) 26. C) 42. D) 36. Show Answer Correct Answer: A) 60. 25. 1) The water droplets are spherical in free fall due to A) Gravity. B) Inter molecular attraction. C) Surface tension. D) Viscosity. Show Answer Correct Answer: C) Surface tension. ← 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