This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 13 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Most of the mass in an atom is concentrated in the ..... A) Electrons. B) Nucleus. C) Protons. D) Empty space. Show Answer Correct Answer: B) Nucleus. 2. De Broglie equation is the mathematical expression to support A) Line Spectrum of hydrogen. B) Energy of a particular shell. C) Uncertainty in position of an electron. D) Dual nature of matter. Show Answer Correct Answer: D) Dual nature of matter. 3. Heisenberg Uncertainty principle is significant for ..... A) Microscopic objects. B) Any object. C) Macroscopic objects. D) All objects. Show Answer Correct Answer: A) Microscopic objects. 4. An element has 17 protons and 18 neutrons in the nucleus. What is the element's mass number? A) 17. B) 18. C) 1. D) 35. Show Answer Correct Answer: D) 35. 5. Atoms of same element with same atomic number but different mass number A) Isotones. B) Isotopes. C) Isotherm. D) Ispbars. Show Answer Correct Answer: B) Isotopes. 6. The central region of an atom where most of the atom's mass can be found A) Nucleus. B) Electron cloud. C) Core. D) Center. Show Answer Correct Answer: A) Nucleus. 7. Negatively charged particles within the electron cloud outside the nucleus. A) Neutrons. B) Protons. C) Electrons. D) Isotopes. Show Answer Correct Answer: C) Electrons. 8. Why does the nucleus of an atom always have a positive charge? A) The nucleus is positive because it contains protons. B) The nucleus is positive because it contains neutrons. C) The nucleus is positive because it contains electrons. D) None of the above. Show Answer Correct Answer: A) The nucleus is positive because it contains protons. 9. How many protons are present in phosphorus-31 A) 15. B) 16. C) 31. D) 46. Show Answer Correct Answer: A) 15. 10. The one or two letters used to represent an element is its A) Atomic mass. B) Atomic number. C) Element name. D) Element symbol. Show Answer Correct Answer: D) Element symbol. 11. There are four elements P, Q, R and S having atomic numbers of 4, 18, 10 and 16 respectively. The elementwhich can exhibit covalency as well as electrovalency will be: A) P. B) Q. C) R. D) S. Show Answer Correct Answer: D) S. 12. For which one of the following Bohr's Model is NOT valid? A) Deuteron atom($^{2}$H). B) He$^{+}$. C) Hydrogen atom. D) Ne$^{+}$. Show Answer Correct Answer: D) Ne$^{+}$. 13. The Atomic Theory was proposed by the scientist A) E. Rutherford. B) Michael Faraday. C) John Dalton. D) JJ Thomson. Show Answer Correct Answer: C) John Dalton. 14. Thomson proposed that- "An atom consists of a positively charged sphere and the electrons are embedded in it" . A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. N is the symbol for the element ..... A) Nickel. B) Sodium. C) Neon. D) Nitrogen. Show Answer Correct Answer: D) Nitrogen. 16. Lightest particle is A) Electron. B) Neutron. C) Proton. D) None of these. Show Answer Correct Answer: A) Electron. 17. A given principal level n = 4, the energy of its subshells is in the order A) S < p < d < f. B) S > p > d > f. C) S < p < f < d. D) F < p < d < s. Show Answer Correct Answer: A) S < p < d < f. 18. What determines an element's chemical reactivity? A) The number of protons. B) The number of neutrons. C) The number of electrons. D) The number of valence electrons. Show Answer Correct Answer: D) The number of valence electrons. 19. The number of fundamental particles in an atom of the lightest isotope carbon are A) 6. B) 12. C) 18. D) 20. Show Answer Correct Answer: B) 12. 20. Adding or subtracting neutrons (charge = 0, mass = 1) makes the element change into an ..... A) Ion. B) Mixture. C) Isotope. D) Neutral atom. Show Answer Correct Answer: C) Isotope. 21. Which would be the electrical charge on a sulphur atom containing 18 electrons? A) 2-. B) 1-. C) 0. D) 2+. Show Answer Correct Answer: A) 2-. 22. What is the symbol for Mass Number, Atomic Number and element? A) Mass No. = ZAtomic No. = X Element = A. B) Mass No. = XAtomic No. = ZElement = A. C) Mass No. = AAtomic No. = ZElement = X. D) Mass No. = AAtomic No. = XElement = Z. Show Answer Correct Answer: C) Mass No. = AAtomic No. = ZElement = X. 23. Atomic number of last noble gas A) 86. B) 120. C) 118. D) 108. Show Answer Correct Answer: C) 118. 24. How many electrons, protons and neutrons will be present in X$^{-}$, if atomic number of X is 9 and mass number is 19? A) E = 9, P = 9, N = 10. B) E = 10, P = 9, N = 10. C) E = 10, P = 10, N = 10. D) E = 9, P = 10, N = 10. Show Answer Correct Answer: B) E = 10, P = 9, N = 10. 25. Atoms of different elements with different atomic numbers, which have the same mass number, are known as A) Isotopes. B) Isobars. C) Isolation. D) Isotopa. Show Answer Correct Answer: B) Isobars. ← 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