This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Select the incorrect statement about Cathode rays A) The charge to mass ratio of cathode rays does not depend on the nature of gas. B) Cathode rays travel in straight lines in absence of electric and magnetic field. C) Cathode rays move towards the anode. D) Cathode rays consist of positively charged gaseous ions. Show Answer Correct Answer: D) Cathode rays consist of positively charged gaseous ions. 2. The atom has 24 atomic mass and 14 neutrons. How many electron does it have. A) 24. B) 10. C) 14. D) 12. Show Answer Correct Answer: B) 10. 3. How many orbitals can have the following set of quantum numbers, n = 3, l = 1, m1 = 0? A) 3. B) 1. C) 4. D) 2. Show Answer Correct Answer: B) 1. 4. Who first proposed the atomic theory on a scientific basis? A) Ernest Rutherford. B) John Dalton. C) Niels Bohr. D) J.J. Thomson. Show Answer Correct Answer: B) John Dalton. 5. What is the significance of principal quantum number? A) Size & energy level. B) 105 pm. C) 25 pm. D) Chemical bonding. Show Answer Correct Answer: A) Size & energy level. 6. JJ Thomson found that the cathode ray tubes were ..... because they were attracted to the positive plate of an external electric field. A) Positive. B) Negative. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Negative. 7. Who stated that atoms are indivisible A) J . J Thomson. B) John Dalton. C) Neils Bhor. D) E. Rutherford. Show Answer Correct Answer: B) John Dalton. 8. WHAT HAPPENS TO THE ATOMIC NO DURING A CHEMICAL REACTION? A) IT INCREASES. B) IT DECREASES. C) REMAINS SAME. D) CHANGES ALTERNATIVELY. Show Answer Correct Answer: C) REMAINS SAME. 9. What is the maximum number of electrons in an orbital? A) 2. B) 1. C) 3. D) 4. Show Answer Correct Answer: A) 2. 10. The different orbits or energy levels of an atom according to Bohr Model are called A) Excited states. B) Stationary states. C) Ground state. D) Energy levels. Show Answer Correct Answer: B) Stationary states. 11. An atom of a certain element has 19 protons, 19 electrons, and a mass number of 39. At room temperature this element is not a very stable. How many neutrons are in this atom? A) 36. B) 84. C) 72. D) 20. Show Answer Correct Answer: D) 20. 12. The ..... of an atom is the sum of the protons and neutrons in the nucleus of that atom. A) Mass number. B) Atomic number. C) Atomic weuight. D) Isotope weight. Show Answer Correct Answer: A) Mass number. 13. 1Assertion (A):Black body is an ideal body that emits and absorbs radiations of all frequencies.Reason (R):The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature. A) Both A and R are true and R is the correct explanation of A. B) Both A nd R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false but R is true. Show Answer Correct Answer: B) Both A nd R are true but R is not the correct explanation of A. 14. What does the atomic number (Z) represent? A) Total number of nucleons. B) Number of electrons in an ion. C) Number of protons. D) Number of neutrons. Show Answer Correct Answer: C) Number of protons. 15. What is the difference between the number of electrons in an atom of Selenium (Se) which has an atomic number of 34, and the number of electrons in an atom of Aluminum (Al) which has an atomic number of 13 A) There is no difference. B) 21. C) There is not enough information to answer this question. D) 47. Show Answer Correct Answer: B) 21. 16. Electronic configuration of Neon A) 1s$^{1}$ 2s$^{2}$ 2p$^{6}$. B) 1s$^{2}$ 2s$^{2}$ 2p$^{6}$. C) 1s$^{2}$ 2s$^{0}$ 2p$^{6}$. D) 1s$^{1}$ 2s$^{1}$ 2p$^{6}$. Show Answer Correct Answer: B) 1s$^{2}$ 2s$^{2}$ 2p$^{6}$. 17. Which of the following atoms would have a mass number of 27? A) 13 protons, 14 neutrons, 13 electrons. B) 27 protons, 32 neutrons, 27 electrons. C) 23 protons, 27 neutrons, 23 electrons. D) 9 protons, 10 neutrons, 9 electrons. Show Answer Correct Answer: A) 13 protons, 14 neutrons, 13 electrons. 18. The proper pair of the L value with the orbital shape. A) 0; f. B) 3; p. C) 1; s. D) 2; d. Show Answer Correct Answer: D) 2; d. 19. Which subatomic particle has a negative charge? A) Electron. B) Positron. C) Neutron. D) Proton. Show Answer Correct Answer: A) Electron. 20. The most element in the earth's crust is A) Oxygen. B) Nitrogen. C) Silicon. D) None of the above. Show Answer Correct Answer: A) Oxygen. 21. Smallest energy shell is? A) K. B) L. C) M. D) N. Show Answer Correct Answer: A) K. 22. The mass number of an element is the number of A) Protons and electrons. B) Protons. C) Electrons and neutrons. D) Protons and neutrons. Show Answer Correct Answer: D) Protons and neutrons. 23. What is a pure substance made of one kind of atom called? A) Element. B) Compound. C) Ion. D) Isotope. Show Answer Correct Answer: A) Element. 24. Which particle has a positive charge A) Neutron. B) Electron. C) Proton. D) Nucleon. Show Answer Correct Answer: C) Proton. 25. 19-Which of the reactions will need the maximum amount of energy? A) Na $\rightarrow$ Na$^{+}$ + e$^{-}$. B) Ca$^{+}$ $\rightarrow$ Ca$^{2+}$ + e$^{-}$. C) K$^{+}$ $\rightarrow$ K$^{2+}$ + e$^{-}$. D) Al$^{2+}$ $\rightarrow$ Al$^{3+}$ + e$^{-}$. Show Answer Correct Answer: C) K$^{+}$ $\rightarrow$ K$^{2+}$ + e$^{-}$. ← 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