D&F-BLOCK ELEMENTS

Transcription

1 D&F-BLOCK ELEMENTS INTRODUCTION 1. The following belongs to d-block but it is not a transition element Mn Fe Zn 4) Cr. The following is not a typical transition element Cu Ag Au 4) Mn 3. Which of the following statement regarding transition elements is false Their atoms contain partially filled d orbitals They are capable of showing variable valencies All of their ions are colourless 4) They form complexes readily 4. Which set of elements is transitional in character? Fe, Co, Ni Ru, Rh, Pd Os, Ir, Pt 4) all the above 5. Which of following is a true transition element? Zinc Cadmium Aluminium 4) Iron 6. Which of the following is not an element of first transition series? Fe Co Ni 4) Ag 7. Which of the following set of elements does not belongs to transitional elements? Fe, Co, Ni Cu, Ag, Au Ti, Zr, Hf 4) Ga, In, Tl 8. In the transition elements the incoming electron occupies [n-1]d sublevel in preference to np ns [n-1]d 4) [n+1]s 9. Catalytic activity of transition elements and their compounds is due to their Small size Vacant d-orbitals Higher densities 4) Colour 10. Best conductor of electricity is Cu Al Au 4) Ag 11. Transition metals are good electrical conductors because They are metals They are solids They have free electrons in outer energy levels 4) they are hard. 1. Which of the following set of elements are transition elements? Po, At, Rn Ga, In, Tl Cs, Ba, La 4) Ac, Ku, Ha 13. Which of the following is not correct about transition metals? Their melting and boiling points are high Their compounds are generally coloured They can form ionic or covalent compounds 4) They do not exhibit variable valency 14. The only liquid element in d block is Hg Sc Zn 4) Th 15. Total number of elements present in VIII B group is ) Chemically Zinc group elements closely resemble I A group II A group III A group 4) IV A group 17. The following is not a noble metal Au Cu Ag 4) Pt

2 18. The transition metal present in vitamin B1 is Fe Co Ni 4) Na 19. Incorrect statement is d-block elements usually form coloured ions Mn + ions are much more capable of forming complexes than the Zn + ions Alkali metals are strong reducing agents 4) All the cations of d-block elements are paramagnetic ELECTRONIC CONFIGURATION 0. General electron configuration of d-block elements is nsnp6nd1-10 (n- d1-10 ns0- np0-6 (n- d 1-10 ns 1-4) nd 1-9 ns 0-1. The ground state electronic configuration of chromium is against Hund s rule Pauli s principle Auf-bau principle 4) Boyle principle. Which of the following is the stable electron configuration of Fe +3 ion? 3d64s0 3d5 4s0 3d6 4s 4) 3d4 4s 3. The following has pseudo-inert gas configuration in the (n- shell. Typical transition elements Zinc group elements Both 4) Neither 4. The general configuration (n- d 3 ns indicates that particular element belongs to the following group II B I B V B 4) III B 5 Which of the following ion has same number of unpaired electrons as that of V 3+ ion Cr +3 Mn + Ni + 4) Fe Which one of the following pairs of ions has the same electronic configuration? Fe + and Mn + Fe +3 and Mn + Pr +3 and Fe +3 4) Mn + and Ni + 7. In which of the following elements, the configuration is against Auf-bav rule? Ni, Pd, Pt Sc, Ti, Zr Pd, Pt, Cu 4) Fe, Cr, Mn 8. The configuration of chromium atom in ground state is [Ar] 3d 4 4s 1 [Ar] 3d 5 4s 1 [Ar] 3d 6 4s 4) [Ar] 3d 7 4s 9. Which of the following has more unpaired d-electrons? Zn + Fe + Ni + 4) Cu The outer electron configuration of first transition series is (n-d1-10 ns1-,. The value of n is ) A transition metal x has the configuration [Ar] 3d 4 in its +3 oxidation state. The element is Mn Fe Ti 4) K

3 3. The outer electronic configuration of the element Mo ( Z=4 ) is s 4d 5s 4d 5s 5p 4 4) 4s 3d 33. In which group of the d-block the electronic configuration is not as expected III B IV B VI B 4) II B 34. The outside energy levels of an atom have the configuration s p6 d5 s. The atom belongs to Copper family Zinc family Iron family 4) Manganese family 35. The atomic number (Z) of an element is 5 in its ground state, how many electrons are present in the N shell? )3 36. Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one of them? ( n 1 ) d 8 ns ( n 1 ) d 5 ns 1 ( n 1 ) d 3 ns 4) ( n 1 ) d 5 ns 37. Abnormal electronic configurations are observed in Cu, Cr Pd, Pt Cr, Ni 4) Both 1 & OCCURANCE OF TRANSITION ELEMENTS 38. In the following pair of d-block elements, the first member is a liquid at room temperature and the second member is mostly available in the earth s crust. The pair is Hg, Fe Hg, Tc Hg, Zn 4) Hg, Au 39. The chemical formula of siderite Fe O Fe 3 3O4 FeCO 3 4) MnO 40. The mineral of silver is Argentite Horn silver Sylvine 4) Both 1 and 41. The mineral of Manganese is Pyrolusite Haematite Siderite 4) Rulite 4. Calamine is the mineral of Fe Zn Co 4) Ti 43. The chemical formula of chromite mineral FeO. Cr O3 FeS ZnS 4) AgS CHARACTERISTIC OF 3d SERIES 44. Which of the following group elements exhibits high melting and boiling points IVB VB VIB 4) IIB 45. Transition elements have high MP& BP due to Use of ns electrons use of (n-d electrons only Both ns and (n-d electrons 4) use of np electrons 46. Which group elements exhibits highest densities IIIB IVB VIB 4) VIIIB 47. Which element exhibits highest density in 3d series Sc Cr Zn 4) Cu

4 48. The only element that exhibits positive SRP value V Zn Fe 4) Cu OXIDATION STATES OF 3d SERIES 49. The following does not show variable valency Mn Fe Zn 4) Cr 50. Element which can show +, +3, and +7 oxidation states is Cr Mn Co 4) V 51. Maximum oxidation state exhibited by Osmium is ) An element M has the electron configuration [Ar] 3d54s. Which one of its oxide is unlikely to exist? MO M O 3 MO 4 4) M O Which of the following element exhibits maximum oxidation state Mn Co Fe 4) Zn 54. In which of the following compounds iron has the lowest oxidation state Fe (CO) 5 Fe O K 4 [Fe(CN) 6 ] 4) FeSO 4 (NH 4 ) SO 4. 6H O 55. The stable oxidation states of Cr are + 3, , , + 4 4) +, Which of the following element forms an oxide with highest Valency. V Cr Mn 4) Fe 57. An element has [Ar]3d 4 configuration in its +3 oxidation state Atomic number of the element is 5 6 4) Number of d-electrons in chromium of [Cr (H O) 6 ] +3 ion are 1 3 4) Maximum number of unpaired electrons is present in Ti + Sc +3 Cr +3 4) Mn Due to the loss of the following electrons, Transition metals exhibit variable valency ns ns and np (n- d 4) (n-d and ns ATOMIC AND IONIC RADII OF 3d SERIES 61. Which of the following pairs of elements have same radii? Zr,Hf Sc, Y La, AC 4) Zn, Cd 6. The correct order of atomic sizes is Sc < Y < La Ti < Zr < Hf Sc > Y > La 4) All COLOURS OF TRANSITION METAL IONS 63. Which of the following cation is colourless in its aqueous solution? Cu+ Sc+3 Fe+3 4) Co+3

5 64. Which of the following ion is coloured in its aqueous solution? Cd + Zn + Sc +3 4) Ti Transition metals are coloured due to the following electronic transition d - s d - d s - p 4) f - s 66. Cuprous ion is colorless while cupric ion is coloured because, Cuprous ion has completed d-orbitals while cupric ion has incomplete d-orbitals Cuprous ion has exactly half-filled d orbitals Cupric ion has completely filled d orbitals, while Cuprous ion has incompletely filled d orbitals 4) Cupric ion has half - filled d-orbitals 67. The following ion is colored in aqueous solution Zn + Cd + Co 3+ 4) all the above 68. Colour of ferrous ion is Red Blue Pale green 4) Pale yellow 69. In which pair, both ions are coloured in aqueous medium Sc +3, Zn + Cu +, Ti +4 Ti +3, Co +3 4) Cd +, Mn The absorbed and emitted colours of hydrated ion are respectively Pink and green blue and red red and blue 4) green and pink 71. The following ion shows colour not due to d-d transistion CrO 4 Cr O 7 MnO 4 7. The compound having Blue colour is CuSO 4 CuSO 4. 5H O 4) All PbSO 4 4) HgSO Coloured complexes absorb radiations in the Visible region infrared region ultraviolet region 4) far infrared 74. The splitting of degenerated d-orbitals takes place into which of the following two sets. d xy,d,dxz andd yz,d z x y d xy,d yz,dzx andd,d x y z d xy,d,d andd x y z yz,d xz d xy,d,dxz andd yz,d x y z 4) 75. The colour of MnO - 4 ion is due to Unpaired electrons d - d transition d - p transition 4) charge transfer 76. During the splitting of degenerate d-orbitals under the influence of ligand the average d-orbital energy remains same increases decreases 4) may increase or decrease 77. The order of colours exhibited by and ions are respectively green, blue, yellow blue, green, yellow yellow, blue, green 4) blue, yellow, green

6 78. Which one of the following compound is both coloured and paramagnetic? ScCl 3 TiCl 4 CrCl 3 4) CuCl 79. The aqueous solution of the following salt has colour Zn (NO 3 ) NiSO 4 CaCl 4) NaCl 80. Ti 3+ is purple, but Ti 4+ is colourless. This is because d 1 configuration of Ti 3+ and d 0 configuration of Ti 4+ d1 configuration of Ti3+ and d10 configuration of Ti4+ d0 configurationof Ti3+ and d1 configuration of Ti4+ 4) d 10 configuration of Ti 3+ and d 1 configuration of Ti 4+ CATALYTIC PROPERTIES 81. The catalyst used in the oxidation of 1 alcohol to aldehydes Fe + Mo Pt + Ir 4) Raney Ni 8. Which of the following is used as Catalyst in the hydrogenation of oils? V O 5 Pd Fe 4) Ni 83. The catalyst used in the polymerization of ethylene is RAl+ TiCl 3 4 SnCl4 Ni 4) Pt MAGNETIC PROPERTIES 84. The ion having maximum magnetic moment is Co +3 Cr +3 Ni + 4) Cu Which of the following ion is diamagnetic? Zn + Cr +3 Fe +3 4) Mn The following metal shows ferromagnetic nature Co Cr Cu 4) Mn 87. The following species is repelled by a magnetic field Hg + Fe + Co +3 4) Ni For a paramagnetic substance, the field strength of substance ( B ) and applied field strength ( H) are related as B = H B < H B > H 4) B >>> H 89. The following is not a ferromagnetic Fe Co Y 4) Ni 90. Substances which are repelled by the external magnetic field are called Diamagnetic paramagnetic Ferromagnetic 4) antiferromagnetic 91. Magnetic moment of diamagnetic substance in Bohr Magnetons is ) zero

7 9. The magnetic moment of Fe+ in B.M ) For first row transition metal ions the magnetic moment in Bohr magnetons is calculated by the formula n( n+ 4S( S + n( n+ 4) both & For nd row and 3rd row transition metal ions the magnetic moment in Bohr magnetons is calculated by the formula 4S( S + + L( L + 4S( S + n( n+ 4) All 95. If the magnetic moment of a complex compound is.8 B.M. the number of unpaired electrons in the compound is 1 3 4) Bohr Magneton value in S.I. Units is erg T J T 4 1 ( μ ) 97. The observed magnetic moment value obs for ( μ ) cal 3 Ti + V + Co + 4) Cr J T 4) calt 10 1 is higher than calculated magnetic moment value INTERSTITIAL COMPOUNDS 98. Which of the following elements form interstitial compounds? Alkali metals Transition metals Halogens 4) Noble gases 99. Hydrogen occupies the following holes, C and N occupy the following holes Tetrahedral and octahedral Octahedral and tetrahedral Octahedral and octahedral 4) Tetrahedral and tetrahedral 100. Formation of interstitial compound makes the transition metal More softer more ductile more metallic 4) more hard 101. Which of the following is not a interstitial compounds? TiC MoC Fe0.8O 4) CrO ZnO is white in cold and yellow when hot because ZnO sublimes ZnO melts It forms non stoichiometric compound at high temperatures 4) All ALLOY FORMATION 103. The non transition metal present in German silver is Cu Zn Ni 4) Pb

8 104. Transition metal present in the alloy Gun metal is Ni Zn Sn 4) Cu 105. The alloy used in the reduction of nitrites to ammonia is Gun metal Devarda s alloy Solder metal 4) Bronze 106. Invar is used in Furnaces Pendulum rods Guns 4) Bells The common metal present in german silver, bell metal and brass is Fe Cu Zn 4) Sn 108. Which of the following is an alloy of a metal and a non-metal? Bronze electron nichrome 4) steel 109. Which of the following elements is alloyed with copper to form brass Pb Bi Sb 4) Zinc 110. Gun metal is made from Cu, Sn, Zn Cu, Sn Ni, Fe, Cr 4) Cu, Zn 111. Which of the following methods can be used for the preparation of alloys? Melting a mixture of metals Simultaneous eletrolytic deposition of metals By mixing the aqeous solution of the metal salts 4) Both 1 & 11. Which of the following is non-ferrous alloy? Invar Nichrome Wood metal 4) Steel 113. Which of the following properties of elements can be modified by the formation of alloys? resistance to corrosion toughness malleability & ductility 4) All POTASSIUM PERMANGANATE 114. When reacts with acidified Only is oxidized Only is oxidized Is oxidized and is reduced 4) and oxidized 115. In permanganate ion, manganese has an oxidation number of +7. Therefore it is oxidized hybridized hydrolyzed 4) Aniseed 116. When acts as oxidizing agent in acidic medium, the oxidation number of Mn decreases by 1 3 4) Potassium permanganate acts as an oxidant in neutral, alkaline as well as acidic media. The final products obtained from it in the three conditions are, respectively MnO 3+ 4 and Mn + MnO, MnO and Mn + MnO, MnO + and 4) MnO, MnO and Mn + Mn +

9 118. When is fused with KOH, a colored compound is formed, the product and its color is, purple green, purple, brown 4), black POTASSIUM DICHROMATE 119. Number of moles of reduced by one mole of iodide ions is 3 1/3 6 4) 1/6 10. Chromyl chloride when dissolves in NaOH solution gives yellow solution. The yellow solution contains CrO 7 CrO 4 CrO 5 Cr 4) O3 11. When chromite ore is fused with NaOH in the presence of air, the product formed is Na CrO 7 Cr O3 NaCrO 4 KCrO 4) 7 1. Number of moles of reduced by one mole of ions is 1/3 3 1/6 4) Number of Cr-O bonds in dichromate ion is ) In dichromate dianion 4 Cr-O bonds are equivalent 6 Cr-O bonds are equivalent all Cr-O bonds are equivalent 4) all Cr-O bonds are non-equivalent 15. Chromite ore has the formula FeCrO FeO. Cr 4 O3 FeCrO 7 4) Both ( and ( 16. When is passed through acidified solution The solution turns blue The solution is decolourised Is reduced 4) Green is formed KEY LEVEL - I ) 4 05) 4 06) 4 07) 4 08) 1 09) 10) ) 1 15) 3 16) 17) 18) 19) 4 0) ) 3 5) 3 6) 7) 3 8) 9) 30) ) 4 35) 36) 4 37) 4 38) 1 39) 3 40) ) 45) 3 46) 4 47) 4 48) 4 49) 3 50) ) 1 55) 1 56) 3 57) 1 58) 3 59) 4 60) ) 4 65) 66) 1 67) 3 68) 3 69) 3 70) 4

10 ) 75) 4 76) 1 77) 78) 3 79) 80) ) 1 85) 1 86) 1 87) 1 88) 3 89) 3 90) ) 1 95) 96) 97) 3 98) 99) 1 100) ) 4 105) 106) 107) 108) 4 109) 4 110) ) 3 115) 116) 4 117) 118) 1 119) 4 10) ) 15) 4 16) 4 F-BLOCK ELEMENTS LANTHANIDES INTRODUCTION 1. Lanthanoids are: 14 elements in the seventh period (At. no. 90 to 10 that are filling 5f sublevel. 14 elements in the sixth period (At. No. 58 to 7 that are filling 4f sublevel 14 elements in the seventh period (At. No.58 to 7 that are filling 4f sublevel. 4) 14 elements in the sixth period (At.No.90 to 10. Which of the following Lanthanoid is radioactive? Cerium Promethium Thulium 4) Lutetium 3. The most common Lanthanoid is Lanthanum Cerium Samarium 4) Plutonium 4. Non-Lanthanoid atom is La Lu Pr 4) Pm 5. Lanthanides are characterized by the filling of the Penultimate 4f energy level antipenultimate 4f energy level penultimate 5f energy level 4) antipenultimate 5f energy level

11 6. d -block elements form complexes because they have : Vacant orbitals small sizes Higher nuclear charge 4) all of the above 7. Which sub shell is filled up progressively in actinoids 4f 5f 6d 4) 7s 8. The correct statement (s) from among the following is/are: i) All the d and f-block elements are metals. ii) All d and f-block elements form coloured ions. iii) All d and f-block elements are paramagnetic. i only i and ii ii and iii 4) All ELECTRONIC CONFIGURATION AND OXIDATION STATES 9. Which of the following is not the configuration of Lanthanoid [Xe]4f 10.6s [Xe] 4f 1 5d 1.6s [Xe]4f 14 5d 10 6s 1 4) [Xe]4f 7 5d 1.6s 10. The electronic configuration of f-block elements is represented by (n- f 1-14 (n- d 0-1 ns (n- f 1-14 (n- d 0-5 ns 0- (n- f 1-14 (n- d 0-10 ns 1-4) (n- f 1-14 (n- d 0- (n-s 11. The electronic configuration of cerium is [Xe] 4f 0 5d 1 6s [Xe] 4f 1 5d 1 6s [Xe] 4f 5d 0 6s 4) Both and 3 1. The most common oxidation state of Lanthanoids is ) The most common oxidation states of cerium are + and and and +5 4) + and The outer shell electronic configuration of Gd (Z = 64) is 4f 75d16s 4f 86s 4f 9 6s 1 4)4f 7 5d 6s The +3 ion of which one of the following has half filled 4f sub shell? La Lu Gd 4) Ac 16. Which of the following elements shows more number of oxidation states in its compounds? Am Gd La 4) Eu 17. Lanthanoid for which + and +3 oxidation states are common is La Eu Ce 4) Nd

12 18. Cerium (Z = 58) is an important member of the Lanthanides. Which of the following statements about cerium is incorrect? The +3 oxidation state of cerium is more stable than the +4 oxidation state. The common oxidation states of cerium are +3 and +4 Cerium (IV) acts as an oxidizing agent 4) The +4 oxidation state of cerium is not known in solutions. 19. The element with the electronic configuration [Xe] 4f 14 5d 1 6s is a Representative element Transition element Actinide element 4) Lanthanide element CHEMICAL REACTIVITY OF LANTHANIDES 0. Which of the following ion is paramagnetic? La 3+ (Z = 57) Lu 3+ (Z = 7 Yb 3+ (Z = 70) 4) Sm 3+ (Z = 6 1. Which of the following is the strongest base? Lu(OH) 3 Ce(OH) 3 Sm(OH) 3 4) Tb(OH) 3. In aqueous solution Eu + acts as? an oxidsing agent reducing agent can act as either of these 4) can not act as either of these 3. The colour of Lanthanoids and Actinoids is due to s-f transitions p-f transitions d-f transitions 4) f-f transitions 4. Which of the following has tendency to act as an oxidising agent? Ce 4+ Sm + Lu3+ 4) Gd3+ 5. Which of the following statement is not correct? is less basic than In Lanthanoid series ionic radius of Ln3+ ions decreases La is actually an element of transition series rather than Lanthanoid series 4) Atomic radii of Zr and Hf are same because of Lanthanoid contraction 6. Many Lanthanoid elements are used to prepare Ceramic materials water softener Superconducting materials 4) Enzyme catalysts

13 7. Which of the following statement concerning Lanthanide elements is false? All Lanthanoids are highly dense metals. Most characteristic oxidation state of Lanthanide elements is +3. The ionic radii of trivalent Lanthanides steadily increase with increase in the atomic number 4) Lanthanoids are separated from one another by ion exchange methods LANTHANIDES CONTRACTION ITS CONSEQUENCES 8. A reduction in atomic size with increase in atomic number is a characteristic of elements of d-block f-block Radioactive series 4) high atomic masses. 9. The Lanthanoid contraction refers to Valence electrons of the Lanthanide series Ionic radius of the series The density of the series 4) Nuclear mass of the series 30. The atomic and ionic radii (M 3+ ions) of Lanthanide elements decrease with increase in atomic number. This effect is called Lanthanoid contraction Lanthanoid expansion Actinoid contraction 4) Actinoid expansion 31. Lanthanoid contraction occurs because the 4f electrons, which are gradually added, create a strong shielding effect the 4f orbitals are greater in size than the 3d and 3f orbitals the 5f orbitals strongly penetrate into the 4f orbitals 4) the poor shielding effect of 4f electrons is coupled with increased attraction between the nucleus and the added electrons. 3. The Lanthanoids contraction is responsible for the fact that Zr and Y have about the same radius Zr and Nb have similar oxidation state Zr and Hf have about the same radius 4) Zr and Zn have the same oxidation state 33. The radius of La3+ (At.No.ofLa=57) is 1.06A. Which one of the following given values will be closest to the radius of Lu3+ (Atomic No. of Lu=7 1.40A 1.06A 0.85A 4) 1.60A 34. The separation of Lanthanoids by ion exchange method is based on basicity of the hydroxides size of the ions the solubility of their nitrates 4) oxidation state of the ion.

14 ACTINOIDS 35. The actinoids showing +7 oxidation states are U, Np Pu, Am Np, Pu 4) Am, Cm 36. Which of the following elements belongs to actinide series? Lu Gd Th 4) La 37. The electronic configuration of actinides cannot be assigned with degree of certainty because of Overlapping of inner orbitals Free movement of electrons over all the orbitals Small energy difference between 5f and 6d levels 4) None of the above KEY 4) 1 5) 6) 4 7) 8) 1 9) 3 10) ) 1 15) 3 16) 3 17) 18) 4 19) 4 0) 4 4 4) 1 5) 1 6) 3 7) 3 8) 9) 30) ) 35) 3 36) 3 37) 1