This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom – Quiz 23 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 2 Structure Of Atom Quiz 23 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following elements is not present in the first twenty elements? A) Boron. B) Neon. C) Sodium. D) Silver. Show Answer Correct Answer: D) Silver. 2. Who was the Greek philosopher who called the smallest particle of matter an "atom" ? A) Democritus. B) Aristotle. C) J.J Thompson. D) Einstein. Show Answer Correct Answer: A) Democritus. 3. An atom has atomic mass 16u and atomic number of 8. How many neutrons are present in the atom? A) 10. B) 7. C) 8. D) 9. Show Answer Correct Answer: C) 8. 4. True or False:Electrons are found in the nucleus. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. An atom has mass 15u. If the number of neutrons is 7, what is the number of electrons? A) 6. B) 0. C) 2. D) 8. Show Answer Correct Answer: D) 8. 6. What atom matches this electron configuration?1s$^{2}$2s$^{2}$2p$^{6}$3s$^{2}$3p$^{6}$4s$^{1}$3d$^{10}$ A) Zinc. B) Copper. C) Nickel. D) Germanium. Show Answer Correct Answer: B) Copper. 7. Mass of an atom is concentrated A) As whole. B) In protons. C) In nucleus. D) In electrons. Show Answer Correct Answer: C) In nucleus. 8. All lanthanoids belong to group A) 3. B) 4. C) 5. D) 16. Show Answer Correct Answer: A) 3. 9. The charge to mass ratio (specific charge) of an electron is A) -1.76 x 10$^{10}$ C/kg. B) -1.76 x 10$^{11}$ C/kg. C) -1.76 x 10$^{12}$ C/kg. D) -1.76 x 10$^{13}$ C/kg. Show Answer Correct Answer: B) -1.76 x 10$^{11}$ C/kg. 10. If an atom has an equal amount of protons and electrons, what will its' charge be? A) Positive. B) Negative. C) Neutral. D) Infinite. Show Answer Correct Answer: C) Neutral. 11. What will always be true of an atom of iron (Fe)? A) 26 neutrons. B) 56 electrons. C) 26 protons. D) 30 electrons. Show Answer Correct Answer: C) 26 protons. 12. Assertion (A):All isotopes of a given element show the same type of chemical behaviour.Reason (R):The chemical properties of an atom are controlled by the number of electrons in the atom. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is not the correct explanation of A. C) A is true but R is false. D) A is false R is true. Show Answer Correct Answer: A) Both A and R are true and R is the correct explanation of A. 13. Which subatomic particle has much less mas than the other two? A) Proton. B) Neutron. C) Electron. D) None of the above. Show Answer Correct Answer: C) Electron. 14. Who proposed that electrons move around the nucleus in circular orbits? A) Dalton. B) Thomson. C) Rutherford. D) Bohr. Show Answer Correct Answer: D) Bohr. 15. The ratio of the masses of oxygen that combines with 2 g of Hydrogen in Hydrogen Peroxide and water is $\frac{2}{1}$ A) Law of conservation of mass. B) Law of definite proportions. C) Law of multiple proportions. D) Law of reciprocal proportions. Show Answer Correct Answer: C) Law of multiple proportions. 16. Which scientist is responsible for first stating that all the atoms of a particular element are identical but are different from the atoms of all other elements? A) Dalton. B) Thomson. C) Aristotle. D) Democritus. E) Proust. Show Answer Correct Answer: A) Dalton. 17. An atom that is diamagnetic is A) An atom with all paired electrons. B) An atom with unpaired electrons. C) Both. D) None of the above. Show Answer Correct Answer: A) An atom with all paired electrons. 18. Number of valence electrons in Cl-ion are: A) 16. B) 8. C) 17. D) 18. Show Answer Correct Answer: B) 8. 19. A neutron has a charge of A) +2. B) No charge. C) -1. D) +1. Show Answer Correct Answer: B) No charge. 20. Where does the mass of an atom come from? A) Protons and neutrons inside the nucleus. B) Protons and neutrons outside the nucleus. C) Protons and electrons inside the nucleus. D) Protons and electrons outside the nucleus. Show Answer Correct Answer: A) Protons and neutrons inside the nucleus. 21. The radius of electron's second stationary orbit in Bohr's atom is R . The radius of the third orbit will be A) 3R. B) 2.25 R. C) 9 R. D) R/3. Show Answer Correct Answer: B) 2.25 R. 22. Who discovered the nucleus using the gold foil experiment? A) Democritus. B) Robert Millikan. C) James Chadwick. D) Ernest Rutherford. Show Answer Correct Answer: D) Ernest Rutherford. 23. Which of the following is not the subatomic particle in the atom? A) Nucleus. B) Protons. C) Electrons. D) Neutrons. Show Answer Correct Answer: A) Nucleus. 24. Energy of electron in first orbit of Hydrogen A) -2.18 x 10$^{-18}$. B) 2.18 x 10$^{-18}$. C) -2.18 x 10$^{18}$. D) 2.18 x 10$^{18}$. Show Answer Correct Answer: A) -2.18 x 10$^{-18}$. 25. Which of the following is not a sub-atomic particle? A) Nucleus. B) Proton. C) Electron. D) Neutron. Show Answer Correct Answer: A) Nucleus. ← 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