Title 3.PERIODIC PROPERTIES.pdf ✅

UNIT CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES 03 Exercise 1: NCERT Based Topic-wise MCQs 3.0 INTRDUCTION 1. Periodic classification of elements is used to examine the NCERT/ Page-74 / N-74 (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 3.1 WHY DO WE NEED TO CLASSIFY ELEMENTS? 2 ∗ . Which of the following is a set containing man made elements? NCERT Page-84 / N-84 (a) Gold, Mercury, Zinc (b) Gold, Radium, Palladium (c) Curium, Osmium, Uranium (d) Technetium, Neptunium, Einsteinium 3.2 GENESIS OF PERIODIC CLASSIFICATION 3*. 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 NCERT/Page-75 / N-75 (a) 162.5 (b) 91.5 (c) 81.25 (d) 45.625 4 ∗ . If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is NCERT/Page N-75 (a) arsenic (b) sulphur (c) iodine (d) calcium 5*. Lothar Meyer plotted the physical properties such as atomic volume, melting point and ...X... against atomic weight. Here, X refers to NCERT Page-76 / N-76 (a) mass (b) boiling point (c) surface tension (d) None of these
6*. The most significant contribution towards the development of periodic table was made by (a) Mendeleev NCERT Page N-78 (b) Avogadro (c) Dalton (d) Cavendish 7. Who developed long form of the periodic table? NCERT Page N-78 (a) Lothar Meyer (b) Neils Bohr (c) Mendeleev (d) Moseley 8 ∗ . Which fact is not valid for Dobereiner's triads? NCERT Page-75 / N-75 (a) The atomic weight of middle element is roughly average of the other two elements (b) The properties of middle element is roughly average of the other two elements (c) The elements of triads belong to the same group of modern periodic table (d) The elements of triads have same valency electrons. 9 *. Select the correct chronological order for the discoveries of the following scientists. NCERT/Page N-78 Dobereiner, Newlands, Chancourtois, Mendeleev (a) Chancourtois, Dobereiner, Newlands, Mendeleev (b) Dobereiner, Chancourtois, Newlands, Mendeleey (c) Dobereiner, Newlands, Chancourtois, Mendeleev (d) Chancourtois, Newlands, Dobereiner, Mendeleev 10 * The molecular formula of chloride of Eka-Aluminium and Eka-Silicon respectively are (a) GaCl3 and SiO4 NCERT/Page N-76 (c) AlCl3 and SiCl4 (b) GaCl3 and AlCl3 (d) GaCl3 and GeCl4 11∗ . In the Mendeleev's periodic table, which of the following element instead of having lower atomic weight was placed after the element of higher atomic weight thereby ignoring the order of increasing atomic weights. (a) Iodine (b) Antimony (c) Bromine (d) Molybdenum 12 . Which of the following is correct about Eka-Aluminium and Eka-Silicon? NCERT/Page-76 / N-76 (a) Oxides of Eka-Aluminium is Al2O3 and Eka-Silicon is Si2O3 (b) Oxides of Eka-Aluminium is Ga2O3 and Eka-Silicon is GeO2 (c) Melting point of Eka-Aluminium is lower than the melting point of Eka-Silicon (d) Both (a) and (c) 3.3 MODERN PERIODIC LAW AND THE PRESENT FORM OF THE PERIODIC TABLE 13. Which of the scientists given below discovered that periodic table should be based on the atomic number? NCERT Page-78 / N-78 (a) Mendeleev (b) Newlands
(c) Moseley (d) Lothar Meyer 14. How many elements are there in 6 th period of periodic table? NCERT Page-78 / N-78 (a) 18 (b) 8 (c) 30 (d) 32 15. The long form of periodic table consists of (a) seven periods and eight groups NCERT/ Page-78 / N-78 (b) seven periods and eighteen groups (c) eight periods and eighteen groups (d) eighteen periods and eight groups 16. Modern periodic table is based on the atomic number of the elements. The experiment which proved the significance of the atomic number was NCERT/ Page-78 / N-78 (a) Millikan'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 3.4 NOMENCLATURE OF ELEMENTS WITH ATOMIC NUMBER>100 17 *. The symbol and IUPAC name for the element with atomic number 120 , respectively are (a) Ubn and unbinilium NCERT/ Page-80 / N-80 (b) Ubn and unbiunium (c) Ubn and unnibium (d) Ubn and unnilium 18∗ . What is the IUPAC name of the element with atomic number 114 ? NCERT Page-80 / N-80 (a) Unununnium (b) Unnilquadium (c) Ununquadium (d) Unnilennium. 19 ∗. The IUPAC nomenclature of an element with electronic configuration [Rn]5f 146d 17s 2 is: (a) Unnilbium NCERT Page N-80 (b) Unnilunium (c) Unnilquadium (d) Unniltrium 3.5 ELECTRONIC CONFIGURATIONS OF ELEMENTS & THE PERIODIC TABLE 20 ∗. Element with electronic configuration 1s 22s 22p 63s 23p 63d 104s 24p 64d 105s 25p 3 belongs to the following group of the periodic table NCERT Page-82 / N-82 (a) 5 th (b) 15 th (c) 3rd (d) 17 th
21 . In the modern periodic table one of the following does not have appropriate position - (a) transition elements NCERT Page N-84 (b) inert gases (c) inner transition elements (d) halogens 22∗ . Element "E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above ' E ' in the group is NCERT Page N-82 (a) 3s 2 , 3p 4 (b) 3d 10 , 4s 2 , 4p 4 (c) 4d 10 , 5s 2 , 5p 4 (d) 2s 2 , p 4 23 ∗. The electronic configuration of four elements are given below. Which elements does not belong to the same family as others? NCERT Page-82 / N-82 (a) [Xe]4f 145d 106s 2 (b) [Kr]4d 105s 2 (c) [Ne]3s 23p 5 (d) [Ar]3d 104s 2 24 ∗. The elements with atomic numbers 9,17,35,53 and 85 belong to NCERT Page N-84 (a) alkalimetals (b) alkaline earth metals (c) halogens (d) noble gases 25∗ . Which of the following pairs has both members from the same period of the periodic table. (a) Na − Ca NCERT/Page N-83 (b) Na − Cl (c) Ca − Cl (d) Cl − Br 26∗ . The elements which are characterized by the outer electronic configuration ns 1 to ns 2np 6 are collectively called (a) Transition elements (b) Representative elements (c) Lanthanides (d) Inner transition elements 27∗ . f-Block elements are called inner transition elements because NCERT Page-84 / N-84 (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 28∗ . An element, which belongs to third period and group 16 in the periodic table has electronic configuration. NCERT Page-82 / N-82 (a) 1s 2 , 2s 22p 6 , 3s 23p 3 (b) 1s 2 , 2s 22p 6 , 3s 23p 4 (c) 1s 2 , 2s 22p 6 , 3s 23p 5 (d) 1s 2 , 2s 22p 4