This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 47 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 47 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. True or false:All neutral atoms have equal numbers of protons and electrons. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. What are the valences possible if there are 15 electrons in an element? A) 3. B) 5. C) Both 3 and 5. D) 8. Show Answer Correct Answer: C) Both 3 and 5. 3. If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is: A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: A) 1. 4. The discovery of an electron by A) Millikan. B) J.J Thomson. C) Rutherford. D) Perrin. Show Answer Correct Answer: B) J.J Thomson. 5. Uncertainity in the position of an electron (mass= 9.1 x 10$^{-31}$ kg) moving with a velocity 300 m/s, accurate upto 0.001% will be A) 5.76 x 10$^{-2}$ m. B) 1.92 x 10$^{-2}$ m. C) 3.84 x 10$^{-2}$ m. D) 19.2 x 10$^{-2}$ m. Show Answer Correct Answer: B) 1.92 x 10$^{-2}$ m. 6. Which orbital shows maximum shielding effect? A) S. B) P. C) D. D) F. Show Answer Correct Answer: A) S. 7. Most of the mass of an atom is: A) In the electrons. B) In the nucleus. C) In the energy levels. D) In the empty space. Show Answer Correct Answer: B) In the nucleus. 8. The energy of electron in the first Bohr orbit of H atom is-13.6 eV. The possible energy value (s) of the excited state(s) for electron in Bohr orbitals of hydrogen is (are) A) -3.4 eV. B) +3.4 eV. C) -6.8 eV. D) All of these. Show Answer Correct Answer: A) -3.4 eV. 9. What did the cathode-ray tube experiment prove? A) Atoms could be broken into smaller parts. B) Atoms caused the changes in matter. C) Atoms join to create compounds. D) The center of an atom has a nucleus. Show Answer Correct Answer: A) Atoms could be broken into smaller parts. 10. The two electrons occupying the same orbital are distinguished by A) Principal Quantum Number. B) Azimuthal Quantum Number. C) Magnetic Quantum Number. D) Spin Quantum Number. Show Answer Correct Answer: D) Spin Quantum Number. 11. When did J.J. Thomson run his cathode-ray tube experiment? A) 1801. B) 460 BCE. C) 1897. D) 1810. Show Answer Correct Answer: C) 1897. 12. The scientist responsible for "discovering" the nucleus is: A) Bohr. B) Rutherford. C) Schroedinger. D) Einstein. Show Answer Correct Answer: B) Rutherford. 13. C is the chemical symbol for the element ..... A) Cobalt. B) Chlorine. C) Carbon. D) Calcium. Show Answer Correct Answer: C) Carbon. 14. Which of the following lists the electromagnetic waves in order of increasing wavelength? A) X-rays, visible light, radio waves. B) Gamma rays, microwaves, UV rays. C) Infrared rays, radio waves, x-rays. D) None of the above. Show Answer Correct Answer: A) X-rays, visible light, radio waves. 15. Which isotope is used in the nuclear power plants to generate electricity? A) Uranium 235. B) Iodine 131. C) Cobalt 60. D) Uranium 238. Show Answer Correct Answer: A) Uranium 235. 16. Atoms with different mass number and atomic numbers but have the same number of neutrons in the nucleus is A) Isotope. B) Isotone. C) Isobar. D) Isomer. Show Answer Correct Answer: B) Isotone. 17. The chargeless particles in an atom are A) Protons. B) Electrons. C) Neutrons. D) Protons and electrons. Show Answer Correct Answer: C) Neutrons. 18. Orbital that is not possible A) 2d. B) 3s. C) 4p. D) 5f. Show Answer Correct Answer: A) 2d. 19. Model of the atom where electrons orbit the nucleus in energy levels A) Thomson. B) Rutherford. C) Bohr. D) Dalton. Show Answer Correct Answer: C) Bohr. 20. The atomic particle with a positive charge is the ..... A) Proton. B) Neutron. C) Electron. D) Nucleus. Show Answer Correct Answer: A) Proton. 21. What is the number of neutrons in phosphorus-31? A) 15. B) 16. C) 31. D) 46. Show Answer Correct Answer: B) 16. 22. What is a valence electron? A) Electrons in the first energy shell. B) Electrons in the second energy shell. C) Electrons in the outer shell. D) Total number of electrons. Show Answer Correct Answer: C) Electrons in the outer shell. 23. There are two species represented as $^{35}$Cl and $^{37}$Cl. Which of the following statement is correct regardingthese species? A) They have different chemical properties. B) Their physical properties are the same. C) They have the same number of protons. D) They are isobars of the same element. Show Answer Correct Answer: C) They have the same number of protons. 24. Atoms of which two elements have a combined total of 23 protons? A) Sodium, Na, and magnesium, Mg. B) Boron, B, and carbon, C. C) Copper, Cu, and zinc, Zn. D) None of these. Show Answer Correct Answer: A) Sodium, Na, and magnesium, Mg. 25. This subatomic particle is located in the electron cloud. A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: C) Electron. ← 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