Periodic Table and Its Properties Exercise # 2

Exercise # 2 Part # I [Multiple Correct Choice Type Questions] 1. An element belongs to 3rd period and group-13 of the Modern periodic table. Which of the following properties will be shown by the element ? (A) Good conductor of electricity (B) Liquid, metallic (C) Solid, metallic (D) Solid, non-metallic 2. Which of the following orders is(are) correct for size : (A) Al  Ga (B) Te2– > I– > Cs+ > Ba2+ 3+ 6+ (C) Cr < Cr (D) Pd  Pt 3. Which of the following statements is/are correct ? (A) The second ionization enthalpy of oxygen element is greater than that of fluorine element. (B) The third ionization enthalpy of phosphorus is greater than that of aluminium. (C) The first ionization enthalpy of aluminium is slightly greater than that of gallium. (D) The second ionization enthalpy of copper is greater than that of zinc. 4. Which of the following elements will gain one electron more readily in comparison to other elements of their group (A) S(g) (B) Na(g) (C) O(g) (D) Cl (g) 5. Which of the following sequences contain atomic numbers of only representative elements ? (A) 3, 33, 53, 87 (B) 2, 10, 22, 36 (C) 7, 17, 25, 37, 48 (D) 9, 35, 51, 88 6. Ionic radii vary in : (A) inverse proportion to the effective nuclear charge. (B) inverse proportion to the square of effective nuclear charge. (C) direct proportion to the screening effect. (D) direct proportion to the square of screening effect. 7. Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e. absorb energy in the visible region of spectrum). The elements of which of the following groups in Modern periodic table will impart colour to the flame ? (A) 2 (B) 13 (C) 1 (D) 17 8. In which of the following arrangements, the order is not correct according to the property indicated against it: (A) increasing size : Cu2+ < Cu+ < Cu (B) increasing E1 : B < C < N < O (C) increasing E1 : B < Al < Ga < In < Tl (D) increasing E1 : Li < Na < K < Rb 9. Ionisation energy of atoms A and B are 350 and 250 kCalmol–1 respectively. The electron affinities of these atoms are 70 and 90 kCalmol–1 respectively. Then : (A) electron cloud is more attracted by A (B) electron cloud is more attracted by B. (C) on Mulliken scale, electronegativity of A is more than B (D) on Mulliken scale, electronegativity of A is less than B 10. Which of the following has/have no unit ? (A) Electronegativity (C) Ionisation enthalpy 11. (B) Electron gain enthalpy (D) Metallic character Poor shielding of nuclear charge by d or f- orbital electrons is responsible for which of the following facts ? (A) Atomic radius of Nb (4d-series) is comparable to that of Ta (5d-series) (B) The Ist ionisation enthalpy of copper is less than that of zinc (C) The value of electron gain enthalpy is more negative for sulphur than for oxygen. (D) The Ist ionisation energy for gold is greater than that of silver. PERIODIC TABLE AND ITS PROPERTIES 12. Which of the following is/are true order(s) ? (A) B+ < B < B– Size (B)  < Br < Cl < F Electron gain enthalpy (C) O < O < O Z eff –– – + (D) Na < Al < Mg < Si 13. Ionisation potential Which of the following statements is/are correct ? (A) Helium has the highest first ionisation enthalpy in the Modern periodic table. (B) Sulphur has less negative electron gain enthalpy than oxygen. (C) Mercury and bromine are liquids at room temperature. (D) In any period of Modern periodic table, atomic radius of alkali metal is the highest. 14. A, B and C are oxides of elements X, Y and Z respectively. X, Y and Z are in the same period of the Modern periodic table. A gives an aqueous solution which turns blue litmus red. B reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly alkaline. Which of the following statement is/are true ? (A) All the three elements are metals. (B) The Pauling electronegativities decrease from X to Y to Z. (C) The atomic radius increases in the order X < Y < Z. (D) X, Y and Z could be phosphorus, aluminium and sodium respectively. 15. Which of the following acids are ortho-acids (A) H3PO4 16. 21. (C) Sb2O5 (D) H4As2O7 (B) H2SnO3 (C) HClO3 (D) HPO3 (C) H2SO3 (D) HNO2 (C) H2SO3 (D) HBO2 (B) HClO4 Names of which of the following end in -ous acid ? (A) HNO2 20. (B) S2O72– Names of which of the following acids end in -ic acid? (A) H2SO4 19. (D) H5lO6 Identify the meta -acids (A) HMnO4 18. (C) H4Si2O7 Prefix pyro-is attached to the names (A) As2O3 17. (B) H3BO3 (B) H2CO3 Select the endothermic step(s) : (A) S–(g) + e–  S2–(g) (B) Ne(g) + e–  Ne–(g) (C) N(g) e–  N–(g) (D) AI2+(g)AI3+(g) + e– Select the incorrect statement(s). (A) E1 of nitrogen atom is less than E1 of oxygen atom. (B) Electron gain enthalpy of oxygen is less negative than selenium. (C) Electronegativity on Pauling scale is 2.8 times the electronegativity on Mulliken scale. (D) Cr6+ is smaller than Cr3+. 22. 23. 24. 25. Which is/are incorrect order for the properties specified ? (A) I > Br > Cl > F (oxidising character) (B) K > Mg > Al > B (metallic character) (C) Li < B < Be < C < O < N < F < Ne (D) Li > Na > K > Rb > Cs (first ionisation enthalpy) (chemical reactivity) Which are correct match :(A) O < C < S < Se — Atomic size (C) MgO < SrO < Cs2O < K2O — Basic character (B) Na < Al < Mg < Si — Ist I.P (D) P4O10 > SO3 > Cl2O7 - Acidic character Which are correct match :(A) O > F > N > C — IInd I.P. (C) N > C > P > Si — E. N. (B) S–2 > Cl– > K+ > Ca+2 — Ionic radius (D) F > Na > Ne — Ist I.P. Which of the following statement is/are not correct:(A) (B) (C) (D) I.P. increases down the group IP of s–block elements is less than corresponding d– block elements If IP > 16 eV higher oxidation state is more stable IP of halogen elements is maximum in their respective period 26. Out of the following statements which is/are correct :(A) H is an element of minimum atomic radius (B) He is an element of highest I.P. (C) Cl is an element of highest EA (D) Li is an element of lowest I.P. 27. AB is predominantly ionic as A+ B– if :(A) (IP)A < (IP)B (B) (EA)A < (EA)B (C) (EN)A < (EN)B (D) Size of A < size of B 28. The properties which are common to the elements belonging to groups 1 and 17 of periodic tables are(A) Electropositive character increases down the group (B) Reactivity decreases from top to bottom (C) Atomic radii increases as atomic number increases (D) Electronegativity decreases on moving down a group 29. The number of which subatomic particle is same in case of chlorine atom and chloride ion : (A) Electron (B) Proton (C) Neutrons (D) All of the above 30. Which of the following show amphoteric behaviour : (A) Zn(OH)2 (B) BeO (C) Al2O3 (D) Pb(OH)2 31. Fluorine is stronger oxidizing agent than chlorine in aqueous solution. This can be attributed to the property : (A) Heat of dissociation (B) Electron affinity (C) Ionization potential (D) Heat of hydration 32. Electron affinify of the elements or ions shown correct : (A) S > O– (B) O > S– (C) O– > S– 33. (D) N– > S Ionization energy of an element is : (A) Equal in magnitude but opposite in sign to the electron gain enthalpy of the cation of the element (B) Same as electron affinity of the element (C) Energy required to remove one valence electron from an isolated gaseous atom in its ground state (D) Equal in magnitude but opposite in sign to the electron gain enthalpy of the anion of the element PERIODIC TABLE AND ITS PROPERTIES 34. Select equations having endothermic step : (A) S–(g)  S2–(g) (B) Na+(g) + Cl–(g)  NaCl(s) (C) N(g)  N–(g) (D) Al2+ (g)  Al3+(g) 35. Consider the following ionization steps : M(g)  M+(g) + e– ; H = 100 eV M(g)  M2+(g) + 2e– ; H = 250 eV select correct statement(s) : 36. (A) I.E.1 of M(g) is 100 eV (B) I.E.1 of M+ (g) is 150 eV (C) I.E.2 of M(g) is 250 eV (D) I.E.2 of M (g) is 150 eV Which of the following statements are correct : (A) F is the most electronegative and Cs is the most electropositive element. (B) The electronegativity of halogens decreases from F to I (C) The electron affinity of Cl is higher than that of F though their electronegativities are in the reverse order (D) The electron affinity of noble gases is almost zero. 37. Diagonal relationships are shown by : (A) Be and Al Part # II (B) Li and Mg (C) Mg and Al (D) B and P [Assertion & Reason Type Questions] Each question has 5 choices (A), (B), (C), (D) and (E) out of which only one is correct. (A) Statement-1 is True, Statement-2 is True ; Statement-2 is a correct explanation for Statement-1. (B) Statement-1 is True, Statement-2 is True ; Statement-2 is NOT a correct explanation for Statement-1. (C) Statement-1 is True, Statement-2 is False. (D) Statement-1 is False, Statement-2 is True. (E) Statement-1 and Statement-2 both are False. 1. Statement-1 : The atomic radii of the elements of the oxygen family are smaller than the atomic radii of the corresponding elements of the nitrogen family. Statement-2 : The members of the oxygen family are more electronegative because they have lower values of nuclear charge, than those of the nitrogen family. 2. Statement-1 : In general, for an element, IE1 < IE2 < IE3 ....... . Statement-2 : After the removal of each successive electron, remaining electrons are held more tightly by the nucleus. So removal of next electron becomes difficult. 3. Statement-1 : Generally, ionisation enthalpy increases from left to right in a period in Modern periodic table. Statement-2 : When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus. 4. Statement-1 : The 4f- and 5f- inner transition series of elements are placed separately at the bottom of the Modern periodic table. Statement-2 : (i) Position of f-block elements prevents the undue expansion of the Modern periodic table i.e., maintains its structure. (ii) Position of f-block elements preserves the principle of classification by keeping elements with similar properties in a single column. 5. Statement-1 : Boron has a smaller first ionisation enthalpy than beryllium. Statement-2 : The penetration of a 2s electron to the nucleus is more than the 2p electron, hence 2p electron is more shielded by the inner core of electrons than the 2s electrons. 6. Statement-1 : NO is an acidic oxide while CrO3 is a basic oxide. Statement-2 : Oxides of metals are generally basic and oxides of non-metals are generally acidic. 7. Statement-1 : The decreasing order of acidic character of CO2, N2O5 , SiO2 and SO3 is SO3 > N2O5 > CO2 > SiO2. Statement-2 : Acidic character of oxides increases on moving top to bottom in a group and decreases on moving left to right in a period in Modern periodic table. 8. Statement-1 : Electron gain enthalpy values of the 3rd period p-block elements of the Modern periodic table are generally more negative than the 2nd period element of the same group. Statement-2 : Due to smaller atomic size of the 2nd period element, its electron density is high which eases the addition of electron. 9. Statement-1 : Metallic character of first group metals of Modern periodic table increases down the group. Statement-2 : On moving top to bottom in first group in Modern periodic table, value of ionisation enthalpy continuously decreases. 10. Statement-1 : Electron gain enthalpy always becomes less negative as we go down a group in Modern periodic table. Statement-2 : Size of the atom increases on going down the group in Modern periodic table and the added electron would be farther from the nucleus. 11 Statement -1 : Size of anion is larger than their parent atom. Statement -2 : Zeff of anion is greater than that of their parent atom. 12. Statement -1 : Atomic radius of inert gases is largest in the period Statement -2 : Effective nuclear charge of inert gases is minimum 13. Statement -1 : 2nd IP of alkali metals is maximum in the period. Statement -2 : Alkali metals has smallest atomic size in the period. 14. Statement -1 : First ionization energy of nitrogen is lower than oxygen. Statement -2 : Across the period effective nuclear charge decreases. 15. Statement -1 : Two successive ionisation energies of Argon are 56.8 eV and 36.8 eV respectively. Statement -2 : Zeff of Ar (3s23p6) is greater than Ar+ (3s23p5). 16. Statement -1 : The third period contains only 8 elements and not 18 like 4th period. Statement -2 : In III period filling starts from 3s1 and complete at 3p6 whereas in IV period it starts from 4s1 and complete after 3d10 and 4s2. 17. Statement -1 : Electron affinity of fluorine is greater than chlorine. Statement -2 : Ionisation potential of fluorine is less than chlorine. EXERCISE - 2 : PART # I 1. A, C 8. B, C, D 15. A, B 2. A, B, D 9. A, C 16. B, D 3. A, B, D 10. A, D 17. B, D 4. A, D 11. A, D 18. A 5. A, D 12. A, C, D 19. A 6. A, C 13. A, C 20. A, B, C, D 7. A, C 14. B, C, D 21. A, C 22. A, D 29. B, C 36. A, B, C, D 23. A, B 30. A, B, C, D 37. A, B 24. A, B, C 31. A, B, D 25. A, C, D 32. A, B 26. A, B, C 33. A, C 27. A, B, C 34. A, C, D 28. A, C, D 35. A, B, D 9. 11 C 13. C PART # II 1. C 14. D 2. A 15. D 3. A 16. A 4. A 17. A 5. A 6. D 7. C 8. C A 10. D 12. C