This quiz works best with JavaScript enabled. Home > Cbse > Class 10 > Science > Periodic Classification Of Elements > Class 10 Science Chapter 5 Periodic Classification Of Elements – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 10 Science Chapter 5 Periodic Classification Of Elements Quiz 3 (26 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Atoms with similar properties are most likely located ..... A) In the same period. B) In the same group. C) In different periods. D) To the right and left of each other. Show Answer Correct Answer: B) In the same group. 2. Which of the following does not form a part of Dobereiner's Triads? A) Mg. B) Ca. C) Sr. D) Ba. Show Answer Correct Answer: A) Mg. 3. Chemical formula of rust is ..... A) Ugly.xh $ _ {2} $ o. B) Ugly $ _ {4} $. Xh $ _ {2} $ o. C) FeO. D) Fe$_{2}$O$_{3}$.xH$_{2}$O. Show Answer Correct Answer: D) Fe$_{2}$O$_{3}$.xH$_{2}$O. 4. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium? A) Z = 38. B) Z =19. C) Z= 21. D) Z = 12. Show Answer Correct Answer: A) Z = 38. 5. Which of the following is the outermost shell for elements of period 2? A) N shell. B) L shell. C) M shell. D) K shell. Show Answer Correct Answer: B) L shell. 6. The arrangement of electrons in modern periodic table is based on their A) Atomic mass. B) Electronic configuration. C) Valence. D) Atomic number. Show Answer Correct Answer: B) Electronic configuration. 7. The atomic number of 4 elements P, Q, R and S are 6, 8, 14 and 16 respectively. Which one of these is a metalloid A) Q. B) S. C) P. D) R. Show Answer Correct Answer: D) R. 8. The number of periods and groups in theperiodic table are ..... A) 7, 18. B) 6, 16. C) 7, 17. D) 8, 18. Show Answer Correct Answer: A) 7, 18. 9. Which of the following belong to same period?Element A B C D EAtomic No 3 2 14 9 6 A) ADE. B) DEA. C) ABC. D) BCD. Show Answer Correct Answer: A) ADE. 10. Mendeleef classified ..... elements A) 63. B) 36. C) 65. D) 56. Show Answer Correct Answer: A) 63. 11. On moving left to right in a period, in the periodic table, metallic character ..... A) Increases. B) First increase, then decreases. C) Remains same. D) Decrease. Show Answer Correct Answer: D) Decrease. 12. The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element A) Scandium. B) Germanium. C) Gallium. D) Aluminium. Show Answer Correct Answer: C) Gallium. 13. What is the name of group number 2 A) Halogens. B) Alkaline earth. C) Metaloids. D) Transition metals. Show Answer Correct Answer: B) Alkaline earth. 14. The following elements belong to the same group EXCEPT? A) Calcium. B) Argon. C) Krypton. D) Helium. Show Answer Correct Answer: A) Calcium. 15. The elements A, B and C belong to groups 1, 14 and 17 respectively of the Periodic Table. Which two elements will form ionic compounds? A) A and B. B) A and C. C) B and C. D) None. Show Answer Correct Answer: B) A and C. 16. The group number and period number respectively of an element with atomic number 8 is A) 16, 2. B) 16, 2. C) 6, 2. D) 6, 8. Show Answer Correct Answer: A) 16, 2. 17. Which of the following atoms is biggest in atomic size A) Calcium. B) Barium. C) Beryllium. D) Magnesium. Show Answer Correct Answer: B) Barium. 18. Upto which element, the Law of Octaves was found applicable? A) POTASSIUM. B) ALUMINIUM. C) MAGNESIUM. D) CALCIUM. Show Answer Correct Answer: D) CALCIUM. 19. ..... is an important metal to formamalgam. A) Mg. B) Hg. C) Ag. D) Al. Show Answer Correct Answer: B) Hg. 20. From top to bottom in a group of the periodic table electropositive character of the element ..... A) Decreases. B) Increases. C) Changes irregularly. D) Remains unchanged. Show Answer Correct Answer: B) Increases. 21. Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is A) 24. B) 14. C) 7. D) 16. Show Answer Correct Answer: B) 14. 22. In the alumino thermic process the role ofAl is ..... A) Reducing agent. B) Oxidizing agent. C) Hydrogenating agent. D) Sulphurising agent. Show Answer Correct Answer: A) Reducing agent. 23. Which of the following were not included in the mendeleev periodic table? A) Halogens. B) Alkali metal. C) Isotopes. D) Non metals. Show Answer Correct Answer: C) Isotopes. 24. What is a triad? A) Group of elements. B) Group of atomic masses. C) Group of compounds. D) None of the above. Show Answer Correct Answer: A) Group of elements. 25. On moving from top to bottom in a group, in the periodic table, valency ..... A) Decreases. B) Increase. C) First increases, then decreases. D) Remains same. Show Answer Correct Answer: D) Remains same. 26. An atom has electronic configuration 2, 8, 7.The atomic number of this element is ..... A) 20. B) 18. C) 17. D) 19. Show Answer Correct Answer: C) 17. ← PreviousRelated QuizzesScience QuizzesClass 10 QuizzesClass 10 Science Chapter 5 Periodic Classification Of Elements Quiz 1Class 10 Science Chapter 5 Periodic Classification Of Elements Quiz 2 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books