This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What are electrons? A) An atom's central regions, which is made up of protons and neutrons. B) Subatomic particles that have negative charges. C) Subatomic particles that have neutral charges. D) Subatomic particles that have positive charges. Show Answer Correct Answer: B) Subatomic particles that have negative charges. 2. E$^{2+}$ has an electron arrangement of 2.8. how many proton does E$^{2+}$ have? A) 10. B) 8. C) 12. D) 2. Show Answer Correct Answer: C) 12. 3. Which experiment led to the discovery of the nucleus? A) Gold foil experiment. B) Oil drop experiment. C) Cathode ray experiment. D) Double-slit experiment. Show Answer Correct Answer: A) Gold foil experiment. 4. In which of the following model of the atom, the positive charge and mass is thought to be uniformly distributed across the atom. A) Dalton's atomic model. B) Thomson's Plum Pudding model. C) Rutherford's nuclear model. D) Bohr's atomic model. Show Answer Correct Answer: B) Thomson's Plum Pudding model. 5. The nucleons are A) I. Protons and electrons e. B) II. Neutrons and electrons I. C) II. Protons and neutrons. D) IV. None of thes. Show Answer Correct Answer: C) II. Protons and neutrons. 6. Charge and mass of electron- A) -1.6 X10$^{-19}$ C and 9.1 X10$^{-27 }$kg. B) 1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. C) -1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. D) 1.6 X10$^{-19}$ C and 9.1 X10$^{-27 }$kg. Show Answer Correct Answer: C) -1.6 X10$^{-19}$ C and 9.1 X10$^{-31 }$kg. 7. Which of the following is a statement of Planck's quantum theory? A) An orbital can accommodate a maximum of two electrons of opposite spins only. B) Electronic transition is accompanied by the emission of electromagnetic radiations. C) Electrons can be excited to higher energy levels by absorbing extra energy. D) Radiant energy can be absorbed or emitted in fixed amounts only. Show Answer Correct Answer: D) Radiant energy can be absorbed or emitted in fixed amounts only. 8. Rutherford's alpha scattering experiment not concluded that at center of an atom nucleus is present. True or false A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 9. What is the smallest piece of an element that still represents that element? A) Atom. B) Mass. C) Proton. D) Neutron. Show Answer Correct Answer: A) Atom. 10. Isotopes are atoms of the same element with different #'s of ..... & therefore different ..... A) Neutrons ; atomic numbers. B) Protons ; atomic numbers. C) Electrons ; mass numbers. D) Neutrons ; mass number. Show Answer Correct Answer: D) Neutrons ; mass number. 11. For the electrons of oxygen atom, which of the following statements is correct? A) Zeff for an electron in a 2s orbital is the same as Zeff for an electron in a 2p orbital. B) An electron in the 2s orbital has the same energy as an electron in the 2p orbital. C) Zeff for an electron in 1s orbital is the same as Zeff for an electron in a 2s orbital. D) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite spin. Show Answer Correct Answer: D) The two electrons present in the 2s orbital have spin quantum numbers ms but of opposite spin. 12. Isotopes are atoms of the same element that have the same number of ..... but different number of ..... Therefore, isotopes of the same element have different masses. A) Protons, neutrons. B) Protons, electrons. C) Neutrons, protons. D) Electrons, protons. Show Answer Correct Answer: A) Protons, neutrons. 13. What discovery did James Chadwick make? A) Nucleus. B) Electrons. C) Protons. D) Neutrons. Show Answer Correct Answer: D) Neutrons. 14. A balloon is rubbed on someone's head. If the balloon now has a negative charge it must have- A) Gained protons. B) Gained electrons. C) Lost protons. D) Lose electrons. Show Answer Correct Answer: B) Gained electrons. 15. Electrons that have not been excited are said to be at: A) High level. B) Base line. C) Set state. D) Ground state. Show Answer Correct Answer: D) Ground state. 16. When a plastic comb is rubbed with dry hair, then what happens? A) Electrons get transferred to the comb due to friction. B) Static charge builds up. C) The comb can now attract tiny pieces of paper. D) All of these. Show Answer Correct Answer: A) Electrons get transferred to the comb due to friction. 17. Which scientist gave the concept of fixed energy levels around the nucleus? A) Ernest Rutherford. B) Neils Bohr. C) J.J.Thomsan. D) None of these. Show Answer Correct Answer: B) Neils Bohr. 18. State the number of unpaired electrons present in Cr A) 3. B) 4. C) 5. D) 6. Show Answer Correct Answer: D) 6. 19. It is the quantum number that describes the energy of an orbital and its atomic size. A) Azimuthal Quantum Number. B) Principal Quantum Number. C) Spin Quantum Number. D) Magnetic Quantum Number. Show Answer Correct Answer: B) Principal Quantum Number. 20. In a sample of ethyl ethanoate (CH$_{3}$COOC$_{2}$H$_{5}$) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it? A) One of the oxygen atoms has gained electrons. B) One of the oxygen atoms has gained two neutrons. C) The two oxygen atoms are isotopes. D) The two oxygen atoms are isobars. Show Answer Correct Answer: C) The two oxygen atoms are isotopes. 21. True or False:The nucleus is the smallest and the lightest part of an atom. A) True. B) False. C) Maybe. D) None of the above. Show Answer Correct Answer: B) False. 22. Bohr atomic model can explain A) The spectrum of hydrogen atom only. B) Spectrum of an atom or ion containing one electron only. C) The spectrum of hydrogen molecule. D) The solar spectrum. Show Answer Correct Answer: B) Spectrum of an atom or ion containing one electron only. 23. An atom of phosphorous has 15 electrons. What is the valency of phosphorous? A) 5. B) 3. C) 2. D) 1. Show Answer Correct Answer: B) 3. 24. The energy possessed by one mole of photons is called A) One joule. B) One electron volt. C) One einstein. D) One joule second. Show Answer Correct Answer: C) One einstein. 25. Has a mass of about 1/2000th the mass of a proton. (we say it has ZERO mass) A) Electron. B) Neutron. C) Nucleus. D) Electron cloud. Show Answer Correct Answer: A) 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