Title 3. Classification of Elements and Periodicity in Properties.pdf ✅

FACT/DEFINITION TYPE QUESTIONS 1. Periodic classification of elements is used to examine the (a) periodic trends in physical properties of elements (b) periodic trends in chemical properties of elements (c) Both (a) and (b) (d) None of the above 2. Cl, Br, I, if this is Dobereiner’s triad and the atomic masses of Cl and I are 35.5 and 127 respectively the atomic mass of Br is (a) 162.5 (b) 91.5 (c) 81.25 (d) 45.625 3. If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is (a) arsenic (b) sulphur (c) iodine (d) calcium 4. The law of triads is applicable to a group of (a) Cl, Br, I (b) C, N, O (c) Na, K, Rb (d) H, O, N 5. In 1800, only ....X.... elements were known. Here, X refers to (a) 63 (b) 31 (c) 114 (d) 92 6. Johann Doberiner gave the idea of trends among physical and ...X... of several groups of three elements. Here, X refers to (a) atomic number (b) atomic mass (c) chemical properties (d) None of these 7. Which of the following is the correct set of elements to Dobereiner’s triads ? (a) 7 39 23 Li Na K (b) 80 127 35.5 Br Cl I (c) 55.85 58.71 58.93 Fe Ni Co (d) Data insufficient 8. On which of the following Dobereiner’s Triad law is not applicable? (a) Cl, Br, I (b) Ca, Sr, B (c) F, Cl, Br (d) Li, Na, K 9. Newlands could classify elements only upto – (a) copper (b) chlorine (c) calcium (d) chromium 10. According to Newlands theory, when elements are arranged in the order of increasing atomic weight which number element had similar properties to the first element. (a) third (b) seventh (c) eighth (d) sixth 11. Lothar Meyer plotted the physical properties such as atomic volume, melting point and ...X... against atomic weight. Here, X refers to (a) mass (b) boiling point (c) surface tension (d) None of these 12. The most significant contribution towards the development of periodic table was made by (a) Mendeleev (b) Avogadro (c) Dalton (d) Cavendish 13. Noble gases were included in Mendeleev’s periodic table in the (a) 1st group (b) 7th group (c) 8th group (d) None of these 14. Mendeleev classified elements in (a) increasing order of atomic groups (b) eight periods and eight groups (c) seven periods and nine groups (d) eight periods and seven groups 15. Select the correct chronological order for the discoveries of the following scientists. Dobereiner, Newlands, Chancourtois, Mendeleev (a) Chancourtois, Dobereiner, Newlands, Mendeleev (b) Dobereiner, Chancourtois, Newlands, Mendeleev (c) Dobereiner, Newlands, Chancourtois, Mendeleev (d) Chancourtois, Newlands, Dobereiner, Mendeleev 16. The molecular formula of chloride of Eka-Aluminium and Eka-Silicon respectively are (a) GaCl3 and SiO4 (b) GaCl3 and AlCl3 (c) AlCl3 and SiCl4 (d) GaCl3 and GeCl4 17. Who developed long form of the periodic table? (a) Lothar Meyer (b) Neils Bohr (c) Mendeleev (d) Moseley 18. At present, how many elements are known (a) 110 (b) 112 (c) 113 (d) 118 CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 3
40 CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 19. Which of the scientists given below discovered that periodic table should be based on the atomic number ? (a) Mendeleev (b) Newlands (c) Moseley (d) Lothar Meyer 20. How many elements are there in 6th period of periodic table? (a) 18 (b) 8 (c) 30 (d) 32 21. Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was (a) Mulliken’s oil drop experiment (b) Mosley’s work on X-ray spectra (c) Bragg’s work on X-ray diffraction (d) Discovery of X-rays by Rontgen 22. The period number in the periodic table corresponds to the ...A... principal quantum number (n) of the elements. Here, A refers to (a) lowest (b) highest (c) middle (d) None of these 23. The symbol and IUPAC name for the element with atomic number 120, respectively are (a) Ubn and unbinilium (b) Ubn and unbiunium (c) Ubn and unnibium (d) Ubn and unnilium 24. Element with which of the following atomic number was named by American Society as Rutherfordium, while by Soviet Society it was named as Kurchatovium? (a) 108 (b) 104 (c) 114 (d) 110 25. What is the IUPAC name of the element with atomic number 114 ? (a) Unununnium (b) Unnilquadium (c) Ununquadium (d) Unnilennium. 26. Element with electronic configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 6 4d 10 5s 2 5p 3 belongs to the following group of the periodic table (a) 2nd (b) 5th (c) 3rd (d) 7th 27. The long form of periodic table consists of (a) seven periods and eight groups (b) seven periods and eighteen groups (c) eight periods and eighteen groups (d) eighteen periods and eight groups 28. All the members in a group in long form of periodic table have the same (a) valence (b) number of valence electrons (c) chemical properties (d) All of the above 29. Elements of which group form anions most readily? (a) Oxygen family (b) Nitrogen family (c) Halogens (d) Alkali metals 30. Element having atomic no. of 56 belongs to which of the following block of periodic table? (a) p- block (b) d-block (c) f- block (d) s-block 31. In the modern periodic table one of the following does not have appropriate position – (a) transition elements (b) inert gases (c) inner transition elements (d) halogens 32. If the atomic number of an element is 33, it will be placed in the periodic table in the (a) First group (b) Third group (c) Fifth group (d) Seventh group. 33. An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2 , you will place it in which group? (a) Fifth (b) Fifteenth (c) Second (d) Third 34. Which of the following is not an actinoid ? (a) Curium (Z = 96) (b) Californium (Z = 98) (c) Uranium (Z = 92) (d) Terbium (Z = 65) 35. The period number in the long form of the periodic table is equal to (a) magnetic quantum number of any element of the period. (b) atomic number of any element of the period. (c) maximum Principal quantum number of any element of the period. (d) maximum Azimuthal quantum number of any element of the period. 36. The electronic configuration of four elements are given below. Which elements does not belong to the same family as others? (a) 14 10 2 [Xe]4f 5d ls (b) 10 2 [Kr]4d 5s (c) [Ne]3s23p5 (d) [Ar] 3d10 4s2 37. The elements with atomic numbers 9, 17, 35, 53 and 85 belong to (a) alkali metals (b) alkaline earth metals (c) halogens (d) noble gases 38. Which of the following pairs has both members from the same period of the periodic table. (a) Na – Ca (b) Na – Cl (c) Ca – Cl (d) Cl – Br 39. The elements which are characterized by the outer electronic configuration ns1 to ns2 np6 are collectively called (a) Transition elements (b) Representative elements (c) Lanthanides (d) Inner transition elements 40. f-block elements are called inner transition elements because (a) they have properties similar to those of transition elements (b) they exist in between transition elements (c) the last electron enters into the f-orbital of the penultimate shell (d) the last electron enters into any orbital of penultimate shell EduHulk CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 41 41. An element, which belongs to third period and group 16 in the periodic table has electronic configuration. (a) 1s2 , 2s2 2p6 , 3s2 3p3 (b) 1s2 , 2s2 2p6 , 3s2 3p4 (c) 1s2 , 2s2 2p6 , 3s2 3p5 (d) 1s2 , 2s2 2p4 42. Which of the following is non-metallic ? (a) B (b) Be (c) Mg (d) Al 43. Which group of the periodic table contains coinage metal ? (a) IIA (b) IB (c) IA (d) None of these 44. The only non-metal which is liquid at ordinary temperature is (a) Hg (b) Br2 (c) NH3 (d) None of these 45. Which is a metalloid? (a) Pb (b) Sb (c) Bi (d) Zn 46. In the long form of the periodic table all the non-metals are placed in (a) s-block (b) p-block (c) f-block (d) d-block 47. Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, F (a) F < O < C < Be < Li (b) Li < Be < C < O< F (c) F < O < C < Be < Li (d) F < O < Be < C < Li 48. Which is the correct order of ionic sizes (At. No. : Ce = 58, Sn = 50, Yb = 70 and Lu = 71) ? (a) Ce > Sn > Yb > Lu (b) Sn > Ce > Yb > Lu (c) Lu > Yb > Sn > Ce (d) Sn > Yb > Ce > Lu 49. The order of increasing sizes of atomic radii among the elements O, S, Se and As is : (a) As < S < O < Se (b) Se < S < As < O (c) O < S < As < Se (d) O < S < Se < As 50. In the ions P3–, S2– and Cl– , the increasing order of size is (a) Cl– , S2–, P3– (b) P3–, S2–, Cl– (c) S2–, Cl– , P3– (d) S2–, P3–, Cl– 51. Which of the following is correct ? (a) Isoelectronic ions have same nuclear charge (b) Isoelectronic ions have same neutrons (c) Isoelectronic ions have same number of electrons (d) All are correct 52. On going down a main sub-group in the periodic table (example Li to Cs in IA or Be to Ra in IIA), the expected trend of changes in atomic radius is a (a) continuous increase (b) continuous decrease (c) periodic one, an increase followed by a decrease (d) decrease followed by increase 53. Why the size of an anion is larger than the parent atom? (a) Due to increased repulsion among the electrons. (b) Due to decrease in effective nuclear charge. (c) Due to increased in effective nuclear charge. (d) Both (a) and (b) 54. Which ionisation potential (IP) in the following equations involves the greatest amount of energy ? (a) Na Na e o (b) 2 KKe o (c) 2 3 C Ce o (d) 2 Ca Ca e o 55. Arrange S, P, As in order of increasing ionisation energy (a) S < P < As (b) P < S < As (c) As < S < P (d) As < P < S 56. The statement that is not correct for periodic classification of elements is : (a) The properties of elements are periodic function of their atomic numbers. (b) Non-metallic elements are less in number than metallic elements. (c) For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals. (d) The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period. 57. Consider the following changes 2 2 A A e : E1 and A A e : E o o The energy required to pull out the two electrons are E1 and E2 respectively. The correct relationship between two energies would be (a) E1 < E2 (b) E1 = E2 (c) E1 > E2 (d) E1 t E2 58. Of the given electronic configurations for the elements, which electronic configuration indicates that there will be abnormally high difference in the second and third ionization energy for the element? (a) 1s2 2s2 2p6 3s2 (b) 1s2 2s2 2p6 3s1 (c) 1s2 2s2 2p6 3s2 3p1 (d) 1s2 2s2 2p6 3s2 3p2 59. Alkali metals are powerful reducing agents because (a) these are metals (b) their ionic radii are large (c) these are monovalent (d) their ionisation potential is low 60. Which of the following metals requires the radiation of highest frequency to cause the emission of electrons ? (a) Na (b) Mg (c) K (d) Ca 61. Halogens and chalcogens family have highly ...P.. electron gain enthalpy. Here, P refers to (a) negative (b) positive (c) zero (d) infinity 62. Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ? (a) Cl < F < O < S (b) O < S < F < Cl (c) F < S < O < Cl (d) S < O < Cl < F 63. The electron affinity for the inert gases is – (a) zero (b) high (c) negative (d) positive 64. The element with positive electron gain enthalpy is (a) hydrogen (b) sodium (c) oxygen (d) neon EduHulk CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES
42 CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 65. Which of the following will have the least negative electron gain enthalpy? (a) P (b) S (c) Cl (d) F 66. Which is the correct order of electronegativity ? (a) F > N < O > C (b) F > N > O > C (c) F > N > O < C (d) F < N < O =C 67. The correct order of decreasing electronegativity values among the elements I-beryllium, II-oxygen, III-nitrogen and IV-magnesium is (a) II > III > I > IV (b) III > IV > II > I (c) I > II > III > IV (d) I > II > IV > III 68. An element having electronic configuration 162622 s4p3s3p2s2s1 forms (a) Acidic oxide (b) Basic oxide (c) Amphoteric oxide (d) Neutral oxide 69. Diagonal relationship is shown by (a) All elements with their diagonally downward elements towards right (b) Most of the elements of second period (c) All 3d series elements (d) None of the above 70. In any period the valency of an element with respect to oxygen (a) Increases one by one from IA to VIIA (b) Decreases one by one form IA to VIIA (c) Increases one by one from IA to IVA and then decreases from VA to VIIA one by one (d) Decreases one by one from IA to IVA and then increases from VA to VIIA one by one 71. What will be the formula of the compound formed by the silicon and bromine ? (a) SiBr2 (b) SiBr4 (c) SiBr3 (d) SiBr 72. Which of the following sequence correctly represents the decreasing acidic nature of oxides ? (a) Li2O > BeO > B2O3 > CO2 > N2O3 (b) N2O3 > CO2 > B2O3 > BeO> Li2O (c) CO2 > N2O3 > B2O3 > BeO> Li2O (d) B2O3 > CO2 > N2O3 > Li2O> BeO STATEMENT TYPE QUESTIONS 73. Choose the correct coding for following statements. Here T stands for True and F stands for False statement. (i) Mendeleev left several gaps in his periodic table for the undiscovered elements. (ii) The gap under aluminium and a gap under silicon was left and these elements were called Eka aluminium and Eka silicon. (iii) Germanium was placed in place of Eka-aluminium and gallium was placed in place of Eka silicon. (a) TTT (b) TFF (c) TTF (d) TFT 74. Which of the following statement(s) about the modern periodic table is/are incorrect ? (i) The elements in the modern periodic table are arranged on the basis of their decreasing atomic number (ii) The elements in the modern periodic table are arranged on the basis of their increasing atomic masses (iii) Isotopes are placed in adjoining group(s) in the periodic table (iv) The elements in the modern periodic table are arranged on the basis of their increasing atomic number (a) (i) only (b) (i), (ii) and (iii) (c) (i), (ii) and (iv) (d) (iv) only 75. Consider the following statements: (i) The discovery of inert gases later on did not disturb Mendeleev's arrangement. (ii) In the present periodic table, periodicity in the properties of elements is related to the periodicity in their electronic configurations. Which of these statement(s) is/are correct ? (a) (i) only (b) (ii) only (c) Both (i) and (ii) (d) Neither (i) nor (ii) 76. Which of the following statements are correct? (i) The second period (n = 2) starts with lithium and third electron enters the 2s orbital. The next element, beryllium has four electrons and has the electronic configuration 1s 22s 2 . From the next element boron, the 2p orbitals are filled with electrons when the L shell is completed at neon (2s 22p 6 ). Thus there are 8 elements in the second period. (ii) Successive filling of 3s and 3p orbitals gives rise to the third period of 8 elements from sodium to argon. (iii) The fourth period (n = 4) starts at potassium and the added electron fill up the first 4s and 4p orbitals than 3d orbital is filled. (iv) Fifth period begins with rubidium with the filling of 5s orbital and ends at xenon with the filling up of the 5p orbital. (a) (i) and (ii) (b) (i), (ii) and (iii) (c) (iii) and (iv) (d) (i), (ii) and (iv) 77. With reference to the chemical element with atomic number 17, consider the following statements: (i) It belongs to second period in the periodic table of chemical elements. (ii) It forms anion with unit negative charge. Which of the statement(s) given above is/are correct ? (a) (i) only (b) (ii) only (c) Both (i) and (ii) (d) Neither (i) nor (ii) 78. Choose the correct codes for the following statements related to s-block elements. Here ‘T’ stands for true and F stands for false statement. (i) They are all reactive metals with low ionization enthalpies. (ii) Their metallic character and reactivity increase as we go down the group. (iii) They are found in pure form in nature. (iv) All the compounds of s-block elements are ionic in nature. (a) TTFF (b) TTFT (c) TTTF (d) TFFF EduHulk CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES