NEET AIPMT Chemistry Chapter Wise Solutions – d-and f-Block Elements

NEET AIPMT Chemistry Chapter Wise Solutions – d-and f-Block Elements

NEET AIPMT Chemistry Chapter Wise SolutionsPhysicsBiology

1. Name the gas that can readily decolourise acidified KMn0₄ solution. (NEET 2017)
(a) S0₂
(b) N0₂
(c) P₂0₅
(d) C0₂

2. HgCl₂ and I₂ both when dissolved in water containing I^– ions, the pair of species formed is (NEET 2017)
(a) Hgl₂ , I^–
(b) Hgl₄^2-  , I₃^–
(c) Hg₂l₂, I^–
(d) Hgl₂ , I₃^–

3. The reason for greater range of oxidation states in actinoids is attributed to (NEET 2017)
(a) actinoid contraction
(b) 5f, 6d and 7s levels having comparable energies
(c) 4f and 5d levels being close in energies
(d) the radioactive nature of actinoids.

4. Which one of the following statements related to lanthanons is incorrect? (NEET-II 2016)
(a) Europium shows +2 oxidation state.
(b) The basicity decreases as the ionic radius decreases from Pr to Lu.
(c) All the lanthanons are much more reactive than aluminium.
(d) Ce(+4) solutions are widely used as oxidizing agent in volumetric analysis.

5. Which one of the following statements is correct when SO₂ is passed through acidified K₂Cr₂0₇ solution? (NEET-I 2016)
(a) SO₂ is reduced.
(b) Green Cr₂ (S0₄ )₃ is formed.
(c) The solution turns blue.
(d) The solution is decolourised.

6. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are (NEET-I 2016)
(a) [Xe]4f⁶ 5d¹ 6s² ,[Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁸5d¹6s²
(b) [Xe]4f⁷ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²
(c) [Xe]4f⁷ 6s², [Xe]4f⁸ 6s² and [Xe]4f⁸ 5d¹ 6s²
(d) [Xe]4f⁶ 5d¹ 6s², [Xe]4f⁷ 5d¹ 6s² and [Xe]4f⁹ 6s²

7. Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium? (2015)
(a) [Xe] 4f⁹ 5s¹
(b) [Xe] 4f⁷5d¹ 6s²
(c) [Xe] 4f⁶5d²6s²
(d) [Xe] 4f⁸6d²

8. Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMn0₄ for complete oxidation? (2015)
(a) FeSO₃
(b) FeC₂0₄
(c) Fe(NO₂)₂
(d) FeS0₄

9. Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27) (2015, Cancelled)
(a) Cr²⁺
(b) Co²⁺
(c) Ni²⁺
(d) Ti³⁺

10. Which of the following processes does not involve oxidation of iron? (2015, Cancelled)
(a) Formation of Fe(CO)₅ from Fe.
(b) Liberation of H₂ from steam by iron at high temperature.
(c) Rusting of iron sheets.
(d) Decolourisation of blue CuS0₄ solution by iron.

11. Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers) (2015, Cancelled)
(a) Zr(40) and Hf(72)
(b) Zr(40) and Ta(73)
(c) Ti(22) and Zr(40)
(d) Zr(40) and Nb(41)

12. The reaction of aqueous KMn0₄ with H₂0₂ in acidic conditions gives (2014)
(a) Mn⁴⁺ and O₂
(b) Mn²⁺ and 0₂
(c) Mn²⁺ and 0₃
(d) Mn⁴⁺ and MnO₂

13. Magnetic moment 2.83 BM is given by which of the following ions? (2014)
(At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)
(a) Ti³⁺
(b) Ni²⁺
(c) Cr³⁺
(d) Mn²⁺

14. Reason of lanthanoid contraction is (2014)
(a) negligible screening effect of ‘f’-orbitals
(b) increasing nuclear charge
(c) decreasing nuclear charge
(d) decreasing screening effect.

15. Which of the following statements about the interstitial compounds is incorrect? (NEET 2013)
(a) They are much harder than the pure metal.
(b) They have higher melting points than the pure metal.
(c) They retain metallic conductivity.
(d) They are chemically reactive.

16. Which of the following lanthanoid ions is diamagnetic? (NEET 2013)
(At. nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
(a) EU²⁺
(b) Yb²⁺
(c) Ce²⁺
(d) Sm²⁺

17. Identify the correct order of solubility in aqueous medium. (NEET 2013)
(a) Na₂S > CuS > ZnS
(b) Na₂S > ZnS > CuS
(c) CuS > ZnS > Na₂S
(d) ZnS > Na₂S > CuS

18. Sc (Z = 21) is a transition element but Zn (Z = 30) is not because (Karnataka NEET 2013)
(a) both Sc³⁺and Zn²⁺ ions are colourless and form white compounds.
(b) in case of Sc, 3d orbitals are partially filled but in Zn these are filled.
(c) last electron is assumed to be added to 4s level in case of Zn.
(d) both Sc and Zn do not exhibit variable oxidation states.

19. Identify the alloy containing a non-metal as a constituent in it. (2012)
(a) Invar
(b) Steel
(c) Bell metal
(d) Bronze

20. Which of the statements is not true? (2012)
(a) On passing H₂S through acidified K₂Cr₂0₇ solution, a milky colour is observed.
(b) Na₂Cr₂0₇ is preferred over K₂Cr₂0₇ in volumetric analysis.
(c) K₂Cr₂0₇ solution in acidic medium is orange.
(d) K₂Cr₂0₇ solution becomes yellow on increasing the pH beyond 7.

21. The catalytic activity of transition metals and their compounds is ascribed mainly to (Mains 2012)
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation states
(d) their chemical reactivity

22. Which of the following exhibits only + 3 oxidation state? (Mains 2012)
(a) U
(b) Th
(c) Ac
(d) Pa

23. Which one of the following does not correctly represent the correct order of the property indicated against it? (Mains 2012)
(a) Ti < V < Cr < Mn; increasing number of oxidation states
(b) Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺ : increasing magnetic moment
(c) Ti < V < Cr < Mn : increasing melting points
(d) Ti < V < Mn < Cr: increasing 2nd ionization enthalpy

24. Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E°M²⁺/M) value has a positive sign? (Mains 2012)
(a) Co (Z = 27)
(b) Ni (Z = 28)
(c) Cu (Z = 29)
(d) Fe (Z = 26)

25. For the four successive transition elements (Cr, Mn, Fe and Co), the stability of +2 oxidation state will be there in which of the following order? (2011)
(a) Mn > Fe > Cr > Co
(b) Fe > Mn > Co > Cr
(c) Co > Mn > Fe > Cr
(d) Cr > Mn > Co > Fe
(At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

26. Acidified K₂Cr₂0₇ solution turns green when Na₂S0₃ is added to it. This is due to the formation of (2011)
(a) Cr₂(S0₄)₃
(b) CrO₄^2-
(c) Cr₂(S0₃)₃
(d) CrS0₄

27. Which of the following ions will exhibit colour in aqueous solutions? (2010)
(a) La³⁺ (Z= 57)
(b) Ti³⁺ (Z= 22)
(c) Lu³⁺ (Z = 71)
(d) Sc³⁺ (Z = 21)

28. Which of the following ions has electronic configuration [Ar]3d⁶? (2010)
(a) Ni³⁺
(b) Mn³⁺
(c) Fe³⁺
(d) Co³⁺
(At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)

29. Which of the following pairs has the same size? (2010)
(a) Fe²⁺, Ni²⁺
(b) Zr⁴⁺, Ti⁴⁺
(c) Zr⁴⁺, Hf⁴⁺
(d) Zn²⁺, Hf⁴⁺

30. Match List I (substances) with List II (processes) employed in the manufacture of the substances and select the correct option. (Mains 2010)

(a) A – (i), B – (iv), C – (ii), D – (iii)
(b) A – (i), B – (ii), C – (iii), D – (iv)
(c) A – (iv), B – (iii), C – (ii), D – (i)
(d) A – (iv), B – (ii), C – (iii), D – (i)

31. Which of the following oxidation states is the most common among the lanthanoids? (Maim 2010)
(a) 4
(b) 2
(c) 5
(d) 3

32. Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? (2009)
(a) 3d⁵4s¹
(b) 3d⁵4s²
(c) 3d²4s²
(d) 3d³4s²

33. The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is (2008)
(a) Mn > Cr> Ti > V
(b) Ti>V>Cr>Mn
(c) Cr > Mn > V > Ti
(d) V>Mn>Cr>Ti

34. Which one of the following ions is the most stable in aqueous solution? (2007)
(At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
(a) V³⁺
(b) Ti³⁺
(c) Mn³⁺
(d) Cr³⁺

35. Identify the incorrect statement among the following: (2007)
(a) Lanthanoid contraction is the accumulation of successive shrinkages.
(b) As a result of lanthanoid contraction, the properties of 4d series of the transition elements have no similarities with the 5d series of elements.
(c) Shielding power of 4f electrons is quite weak.
(d) There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.

36. In which of the following pairs are both the ions coloured in aqueous solution? (2006)
(At. no. : Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)
(a) Ni²⁺, Cu⁺
(b) Ni²⁺, Ti³⁺
(c) Sc³⁺, Ti³⁺
(d) Sc³⁺, Co²⁺.

37. Copper sulphate dissolves in excess of KCN to give (2006)
(a) CU(CN)₂
(b) CuCN
(c) [Cu(CN)₄]^3-
(d) [CU(CN)₄]^2-

38. More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is (2006, 2005)
(a) more active nature of the actinoids
(b) more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
(c) lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals
(d) greater metallic character of the lanthanoids than that of the corresponding actinoids.

39. The number of moles of KMn0₄ reduced by one mole of KI in alkaline medium is (2005)
(a) one
(b) two
(c) five
(d) one fifth.

40. Four successive members of the first row transition elements are listed below with their atomic numbers. Which one ofthem.is expected to have the highest third ionisation enthalpy? (2005)
(a) Vanadium (Z = 23)
(b) Chromium (Z = 24)
(c) Manganese (Z = 25)
(d) Iron (Z= 26)

41. The aqueous solution containing which one of the following ions will be colourless? (2005)
(Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)
(a) Sc³⁺
(b) Fe²⁺
(c) Ti³⁺
(d) Mn²⁺

42. Among the following series of transition metal ions, the one where all metal ions have 3d2 electronic configuration is (2004)
[At. nos. Ti = 22, V = 23, Cr = 24, Mn = 25]
(a) Ti³⁺, V²⁺, Cr³⁺, Mn⁴⁺ .
(b) Ti⁺, V⁴⁺, Cr⁶⁺, Mn⁷⁺
(c) Ti⁴⁺, V³⁺, Cr²⁺, Mn³⁺
(d) Ti²⁺, V³⁺, Cr⁴⁺, Mn⁵⁺

43. Lanthanoids are (2004)
(a) 14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
(b) 14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
(c) 14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
(d) 14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.

44. Which one of the following characteristics of the transition metals is associated with their catalytic activity? (2003)
(a) High enthalpy of atomization
(b) Paramagnetic behaviour
(c) Colour of hydrated ions
(d) Variable oxidation states

45. The basic character of the transition metal monoxides follows the order (2003)
(Atomic no’s. Ti = 22, V = 23, Cr = 24, Fe = 26)
(a) VO > CrO > TiO > FeO
(b) CrO > VO > FeO > TiO
(c) TiO > FeO > VO > CrO
(d) TiO > VO > CrO > FeO

46. The correct order of ionic radii of Y3+, La3″, EU3+ and Lu3+ is (2003)
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)
(a) Y³⁺ < La³⁺ < Eu³⁺ < Lu³⁺
(b) Y³⁺ < Lu³⁺ < Eu³⁺ < La³⁺
(c) Lu³⁺ < Eu³⁺ < La³⁺ < Y³⁺
(d) La³⁺ < Eu³⁺ < Lu³⁺ < Y³⁺

47. General electronic configuration of lanthanides is (2002)
(a) (n – 2) f^1-14 (n – 1) s²p⁶d^0-1 ns²
(b) {n – 2)f^10-14 (n – 1) d^0-1 ns²
(c) (n – 2)f^0-14 (n – 1) d¹⁰ ns²
(d) (n – 2) d^0-1 (n – 1) f^1-14 ns²

48. An atom has electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s², you will place it in (2002)
(a) fifth
(b) fifteenth
(c) second
(d) third.

49. Which of the following shows maximum number of oxidation states? (2002, 2000, 1994)
(a) Cr
(b) Fe
(c) Mn
(d) V

50. Zn gives H₂ gas with H₂S0₄ and HCl but not with HN0₃ because (2002)
(a) Zn act as oxidising agent when react with HNO₃
(b) HN0₃ is weaker acid than H₂S0₄ and HCl
(c) In electrochemical series Zn is above hydrogen
(d) NO₃Θ is reduced in preference to hydronium ion.

51. Which of the following statement is not correct? (2001)
(a) La(OH)₃ is less basic than Lu(OH)₃
(b) In lanthanide series ionic radius of Lu⁺³ ion decreases.
(c) La is actually an element of transition series rather lanthanides.
(d) Atomic radius of Zn and Hf are same because of lanthanide contraction.

52. The most convenient method to protect the bottom of ship made of iron is (2001)
(a) coating it with red lead oxide
(b) white tin plating
(c) connecting it with Mg block
(d) connecting it with Pb block.

53. Which ion is colourless? (2000)
(a) Cr⁴⁺
(b) Sc³⁺
(c) Ti³⁺
(d) V³⁺

54. Which of the following configuration is correct for iron? (1999)
(a) 1s²2s²2p⁶3s²3p⁶4s²3d⁷
(b) 1s²2s²2p²3s²3p²4s²3d⁵
(c) 1s²2s²2p⁶3s²3p⁶3d⁵
(d) 1s²2s²2p⁶3s²3p⁶4s²3d⁶

55. Which of the following has more unpaired d-electrons? (1999)
(a) N³⁺
(b) Fe²⁺
(c) Zn⁺
(d) Cu⁺

56. Bell metal is an alloy of (1999)
(a) Cu + Zn
(b) Cu + Sn
(c) Cu+Pb
(d) Cu + Ni

57. In which of the following compounds transition metal has zero oxidation state? (1999)
(a) NOCIO₄
(b) NH₂.NH₂
(c) Cr0₅
(d) [Fe(CO)₅]

58. Which one of the following elements constitutes a major impurity in pig iron? (1998)
(a) Sulphur
(b) Oxygen
(c) Silicon
(d) Carbon

59. Which one of the following ionic species will impart colour to an aqueous solution? (1998)
(a) Zn²⁺
(b) Cu⁺
(c) Ti⁴⁺
(d) Cr³⁺

60. Which one of the following elements shows maximum number of different oxidation states in its compounds? (1998)
(a) Gd
(b) La
(c) Eu
(d) Am

61. Without losing its concentration, ZnCl₂ solution cannot be kept in contact with (1998)
(a) Pb
(b) A1
(c) Au
(d) Ag

62. Which of the following does not represent the correct order of the property indicated? (1997)
(a) Mn²⁺ > Ni²⁺ < Co²⁺ < Fe²⁺
(b) Fe²⁺ > Co²⁺ > Ni²⁺ > Cu²⁺
(c) Ni²⁺ > Cr²⁺ > Fe²⁺ > Mn²⁺
(d) Se > Ti > Cr > Mn

63. The lanthanide contraction is responsible for the fact that (1997)
(a) Zr and Hf have about the same radius
(b) Zr and Zn have the same oxidation state
(c) Zr and Y have about the same radius
(d) Zr and Nb have similar oxidation state.

64. Which of the following element is responsible for oxidation of water to 0₂ in biological processes? (1997)
(a) Cu
(b) Mo
(c) Fe
(d) Mn

65. The electronic configuration of gadolinium (Atomic No = 64) is (1997)
(a) [Xe] 4f³5d⁵ 6s²
(b) [Xe] 4f⁶ 5d² 6d²
(c) [Xe 4f⁸ 5d⁹ 6s²
(d) [Xe] 4f⁷ 5d¹ 6s²

66. K₂Cr₂0₇ on heating with aqueous NaOH gives (1997)
(a) Cr₂0₇^2-
(b) Cr(OH)₂
(c) CrO₄^2-
(d) Cr(OH)₃

67. A transition element X has a configuration [Ar]3d⁴ in its +3 oxidation state. Its atomic number is (1996)
(a) 22
(b) 19
(c) 25
(d) 26

68. When calomel reacts with NH4OH, we get (1996)
(a) Hg₂0
(b) HgO
(c) HgNH₂Cl
(d) NH₂-Hg-Hg-Cl

69. The electronic configuration of transition elements is exhibited by (1996)
(a) ns¹
(b) ns²np⁵
(c) ns²(n – 1)d^1-10
(d) ns² (n – 1)d¹⁰

70. KMn04 reacts with oxalic acid according to the equation 2MnO₄^–; + 5C₂O₄^2- + 16H⁺—->2Mn²⁺+ 10CO₂+ 8H₂0 Here 20 mL of 0.1 M KMn0₄ is equivalent to (1996)
(a) 50 mL of 0.5 M C₂H₂0₄
(b) 20 mL of 0.1 M C₂H₂0₄
(c) 20 mL of 0.5 M C₂H₂0₄
(d) 50 mL of 0.1 M C₂H₂0₄

71. Amongst TiF₆^2- C0F₆^3- ,Cu₂Cl₂ and NiCl₄^2-L which are the colourless species? (atomic number of Ti = 22, Co = 27, Cu = 29, Ni = 28) (1995)
(a) CoF₆^3- and NiCl₄^2-
(b) TiF₆^2- and Cu₂Cl₂
(c) Cu₂Cl₂ and NiCl₄^2-
(d) TiF₆^2- and CoF₆^3-

72. The mercury is the only metal which is liquid at 0°C. This is due to its (1995)
(a) high vapour pressure
(b) weak metallic bond
(c) high ionization energy
(d) both (b) and (c).

73. Which of the following statement concerning lanthanide elements is false? (1994)
(a) All lanthanides are highly dense metals.
(b) More characteristic oxidation state of lanthanide elements is +3.
(c) Lanthanides are separated from one another by ion exchange method.
(d) Ionic radii of trivalent lanthanides steadily increases with increase in the atomic number.

74. To protect iron against corrosion, the most durable metal plating on it, is (1994)
(a) copper plating
(b) zinc plating
(c) nickel plating
(d) tin plating.

75. When CuS0₄ is electrolysed using platinum electrodes, (1993)
(a) copper is liberated at cathode, sulphur at anode
(b) copper is liberated at cathode, oxygen at anode
(c) sulphur is liberated at cathode, oxygen at anode
(d) oxygen is liberated at cathode, copper at anode.

76. The transition elements have a general electronic configuration (1991)
(a) ns²np⁶nd^1-10
(b) (n-1)d^1-10, ns^0-2, np^0-6
(c) (n-1)d^1-10, ns^1-2
(d) nd^1-10 ns^-2

77. Photographic films and plates have an essential ingredient of (1989)
(a) silver nitrate
(b) silver bromide
(c) sodium chloride
(d) oleic acid.

78. Nitriding is the process of surface hardening of steel by treating it is an atmosphere of (1989)
(a) NH₃
(b) 0₃
(c) N₂
(d) H₂S.

79. While extracting an element from its ore, the ore is ground and leached with dil. potassium cyanide solution to form the soluble product j potassium argentocyanide. The element is (1989)
(a) lead
(b) chromium
(c) manganese
(d) silver.

80. A blue colouration is not obtained when (1989)
(a) ammonium hydroxide dissolves in copper sulphate
(b) copper sulphate solution reacts with K₄[Fe(CN)₆]
(c) ferric chloride reacts with sod. ferrocyanide
(d) anhydrous CuS0₄ is dissolved in water.

81. The electronic configurations of four elements are given below. Which element does not belong to the same family as others? (1989)
(a) [Xe]4f¹⁴5d¹⁰6s²
(b) [Kr]4d¹⁰5s²
(c) [Ne]3s²3p⁵
(d) [Ar]3d¹⁰4s²

82. The oxidation state of Cr in K₂Cr₂0₇ is (1988)
(a) +5
(b) +3
(c) +6
(d) +7

83. Hypo is used in photography to (1988)
(a) reduce AgBr grains to metallic silver
(b) convert metallic silver to silver salt
(c) remove undecomposed silver bromide as a soluble complex
(d) remove reduced silver.

Answer Key

Explanations