This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 41 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 41 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A state of matter made up of charged atoms, uncharged atoms, and free electrons A) Plasma. B) Molecule. C) Atom. D) Atomic. Show Answer Correct Answer: A) Plasma. 2. A subatomic particle that has a positive electric charge A) Proton. B) Neutron. C) Electron. D) Isotope. Show Answer Correct Answer: A) Proton. 3. Positive rays give flash on A) AgNO$_{3}$ plate. B) AgCl plate. C) ZnO. D) ZnS. Show Answer Correct Answer: D) ZnS. 4. What electrical charge does a proton have? A) +1. B) 0. C) -1. D) +2. Show Answer Correct Answer: A) +1. 5. Limiting line of any spectral series in the hydrogen spectrum is the line when n2 in the Rydberg formula is A) Two. B) Four. C) Infinity. D) Zero. Show Answer Correct Answer: C) Infinity. 6. Ns-orbital has ..... nodes, A) N-1. B) N+1. C) 2n. D) 2n$^{2}$. Show Answer Correct Answer: A) N-1. 7. Where is the electron located? A) Orbital. B) Nucleus. C) In the inside of the atom. D) Matter. Show Answer Correct Answer: A) Orbital. 8. What was the major flaw in Rutherford's model? A) It did not account for neutrons. B) It suggested atoms could collapse. C) It did not include electrons. D) It was based on the solid sphere model. Show Answer Correct Answer: B) It suggested atoms could collapse. 9. What determines the chemical element of an atom? A) Number of electrons. B) Number of neutrons. C) Number of protons. D) Atomic mass. Show Answer Correct Answer: C) Number of protons. 10. Which gas is released when sodium carbonate reacts with dilute Hydrochloric acid? A) Hydrogen. B) Oxygen. C) Carbon dioxide. D) None of the above. Show Answer Correct Answer: C) Carbon dioxide. 11. The subatomic particle that determines the identity of an element. A) Neutron. B) Proton. C) Electron. D) Outer shell. Show Answer Correct Answer: B) Proton. 12. Who discovered that the atom had an small, dense, positively charged center? A) Ernest Rutherford. B) J.J Thomson. C) Robert Millikan. D) John Dalton. Show Answer Correct Answer: A) Ernest Rutherford. 13. Elements are represented by chemical symbol. Symbols are written with A) All lower case letters. B) All capital letters. C) Always only one letter. D) At least and ONLY one capital letter. Show Answer Correct Answer: D) At least and ONLY one capital letter. 14. Which of the following electron transition occurs in the ultraviolet range of the elctromagnet spectrum? A) N$_{3 }$to n$_{1}$. B) N$_{3 }$to n$_{2}$. C) N$_{4 }$to n$_{3}$. D) N$_{2 }$to n$_{3}$. Show Answer Correct Answer: A) N$_{3 }$to n$_{1}$. 15. In Bohr's model, atomic radius of the first orbit is X, the radius of 3$^{rd}$ orbit is A) X/3. B) X. C) 3X. D) 9X. Show Answer Correct Answer: D) 9X. 16. Why don't we add electrons when calculating atomic mass? A) Because they are outside the nucleus. B) Because they are negatively charged. C) Because they are substantially smaller than a proton or neutron. D) We actually do add the electrons when solving for mass number. Show Answer Correct Answer: C) Because they are substantially smaller than a proton or neutron. 17. What kind of orbital must an electron with the principal quantum number n = 3 occupy? A) An s-orbital. B) A p-orbital. C) A d-orbital. D) Either an s, a p orbital or a d orbital. Show Answer Correct Answer: D) Either an s, a p orbital or a d orbital. 18. 2 elements X & Y combines to form a compound XY. The same compound is obtained from different experiment. give the law in accordance to above observation A) Law of conservation of mass. B) Law of multiple proportion. C) Law of constant proportion. D) None of the above. Show Answer Correct Answer: C) Law of constant proportion. 19. The maximum number of electrons that a valence shell of an atom can possess is ..... A) 18. B) 7. C) 32. D) 8. Show Answer Correct Answer: D) 8. 20. Which spectral line corresponds to the transition from n=3 to n=2 in hydrogen? A) Red. B) Blue. C) Green. D) Violet. Show Answer Correct Answer: A) Red. 21. How many electrons does Hydrogen have? A) 1. B) 2. C) 0. D) 3. Show Answer Correct Answer: A) 1. 22. An excited electron residing in the energy level n = 4 drops to n = 1. What is the wavelenght of the emission if the frequency is 3.09 x 10$^{15}$ Hz? (c = 3 x 10$^{8}$ ms$^{-1}$) A) 4.69 x 10$^{-6}$ m. B) 2.91 x 10$^{-7}$ m. C) 3.88 x 10$^{-7}$ m. D) 9.71 x 10$^{-8}$ m. Show Answer Correct Answer: D) 9.71 x 10$^{-8}$ m. 23. Radiation that has enough energy to remove an electron from shell cause A) Ionization. B) Excitation. C) All the above. D) None of the above. Show Answer Correct Answer: A) Ionization. 24. Atoms of the same element always have the same number of: A) Neutrons. B) Electrons. C) Protons. D) None of the above. Show Answer Correct Answer: C) Protons. 25. Pairing of electrons do not take place untill each orbital is single filled ..... A) Hundes rule of max. Multiplicity. B) Paulis exculsion principle. C) Afbaus principle. D) None of the above. Show Answer Correct Answer: A) Hundes rule of max. 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