Class 12 Chemistry Ch-8 d and f-block Element MCQs Exam 2027

Topic 1: General Properties of d-Block Elements (Electronic Configuration, Size, Density)

1. The general electronic configuration of d-block elements is: [BSEB, 2023 A]

   (A) $(n-1)d^{1-10} ns^{1}$

   (B) $(n-1)d^{1-10} ns^{1-2}$

   (C) $(n-1)d^{1-10} ns^{0}$

   (D) $ns^{2} (n-1)d^{10}$

2. Electronic configuration of Copper (Z = 29) is: [BSEB, 2025 A]

   (A) $[Ar] 3d^{9} 4s^{2}$

   (B) $[Ar] 3d^{10} 4s^{1}$

   (C) $[Ar] 3d^{8} 4s^{2}$

   (D) $[Ar] 3d^{10} 4s^{2}$

3. Transition elements are: [BSEB, 2021 A]

   (A) Metals

   (B) Non-metals

   (C) d-block elements

   (D) Gases

4. Which of the following is not a first transition series element? [BSEB, 2017 C]

   (A) Iron (Fe)

   (B) Chromium (Cr)

   (C) Magnesium (Mg)

   (D) Nickel (Ni)

5. Atomic numbers of elements in the 3d-transition series are: [BSEB, 2025 A]

   (A) 22 to 30

   (B) 21 to 30

   (C) 21 to 31

   (D) 21 to 29

6. Zinc (Zn) ko sankraman tatva (transition element) nahi maana jata kyunki:

   (A) Ye s-block ka hai

   (B) Iska d-orbital poorn (fully filled) hai

   (C) Ye d-block mein nahi hai

   (D) None of these

7. Which transition element has the smallest atomic radius?

   (A) Sc

   (B) Ni

   (C) Cu

   (D) Zn

8. Which of the following metals has the highest density? [BSEB, 2019 A]

   (A) Pd

   (B) Pt

   (C) Rh

   (D) Hg

9. Which of the following is an element of the second transition series? [BSEB, 2022 A]

   (A) Fe

   (B) Zr

   (C) Pt

   (D) Sc

10. The best conductor of electricity among the following is:

    (A) Iron

    (B) Copper

    (C) Gold

    (D) Silver

11. Which of the following is liquid at room temperature? [BSEB, 2016 C]

    (A) Zn

    (B) Hg

    (C) Cu

    (D) Au

12. Transition metals have complete series of:

    (A) 2

    (B) 3

    (C) 4

    (D) 5

13. In the first transition series (3d series), the density increases from:

    (A) Sc to Cr

    (B) Sc to Fe

    (C) Sc to Ni

    (D) Sc to Zn

14. Shape of d-orbital is:

    (A) Spherical

    (B) Dumbbell

    (C) Double Dumbbell

    (D) None of these

15. Which of the following metals has the minimum density?

    (A) Zn

    (B) Sc

    (C) Ti

    (D) Cr

16. Copper is a member of:

    (A) First transition series

    (B) Second transition series

    (C) Third transition series

    (D) Fourth transition series

17. Which of the following is NOT a d-block member? [BSEB, 2018 A]

    (A) Fe

    (B) Co

    (C) Al

    (D) Ni

18. The noble gas found in abundance in the atmosphere is: [BSEB, 2025 A]

    (A) He

    (B) Ar

    (C) Xe

    (D) Rn

19. Which of the following has the minimum boiling point?

    (A) Na

    (B) Cs

    (C) Zn

    (D) Hg

20. Scandium (Z = 21) ka electronic vinyas hai: [BSEB, 2026 A]

    (A) $[Ar] 3d^1 4s^2$

    (B) $[Ar] 3d^2 4s^1$

    (C) $[Ar] 3d^0 4s^2$

    (D) $[Ar] 4s^2 4p^1$

21. General electronic configuration of transition elements is: [BSEB, 2017 A, 2022 A]

    (A) $(n-1)d^{1-10} ns^{1-2}$

    (B) $(n-1)d^{5} ns^{2}$

    (C) $(n-1)d^{1-5} ns^{0}$

    (D) None of these

22. In transition elements, the electronic configuration of the outermost shell will be: [BSEB, 2017 A]

    (A) $3d^{5}$

    (B) $3d^{2}$

    (C) $3d^{7}$

    (D) $3d^{9}$

23. Total number of known series of transition elements is:

    (A) 2

    (B) 3

    (C) 4

    (D) 5

24. Which element belongs to group 12?

    (A) Zn

    (B) Cd

    (C) Hg

    (D) All of these

25. Atomic number of Iron (Fe) is:

    (A) 24

    (B) 25

    (C) 26

    (D) 27

26. Which of the following is not a member of the second transition series?

    (A) Fe

    (B) Zr

    (C) Pt

    (D) Sc

27. Chromium (Cr) ka atomic number hai:

    (A) 21

    (B) 23

    (C) 24

    (D) 25

28. Silver (Ag) aur Gold (Au) kis block ke tatva hain?

    (A) s-block

    (B) p-block

    (C) d-block

    (D) f-block

Topic 2: Oxidation States & Chemical Reactivity

29. Which of the following transition metals shows the maximum number of oxidation states? [BSEB, 2020 A]

    (A) Mn

    (B) Cr

    (C) Fe

    (D) V

30. Oxidation state of Nickel in $[Ni(CO)_{4}]$ is: [BSEB, 2021 A]

    (A) 0

    (B) +1

    (C) -1

    (D) +4

31. Maximum oxidation state of Chromium is: [BSEB, 2024 A]

    (A) +2

    (B) +3

    (C) +4

    (D) +6

32. The oxidation state of Iron in Brown Ring complex $[Fe(H_{2}O)_{5}NO]SO_{4}$ is: [BSEB, 2018 A]

    (A) +1

    (B) +2

    (C) +3

    (D) 0

33. Which of the following elements of 3d-series does not show variable oxidation states? [BSEB, 2021 A]

    (A) Fe

    (B) Cu

    (C) Ti

    (D) Zn

34. Whose +2 oxidation state is most stable? [BSEB, 2018 A]

    (A) Sn

    (B) Ag

    (C) Fe

    (D) Pb

35. Mn ki +7 oxidation state kis compound mein hoti hai? [BSEB, 2021 A]

    (A) $MnO_{2}$

    (B) $KMnO_{4}$

    (C) $Mn_{2}O_{3}$

    (D) $MnCl_{2}$

36. In which of the following is the oxidation state of Mn minimum? [BSEB, 2022 A]

    (A) $MnSO_{4}$

    (B) $MnO_{2}$

    (C) $Mn_{3}O_{4}$

    (D) $Mn_{2}O_{7}$

37. Oxidation number of Chromium in $[Cr(CO)_{6}]$ is:

    (A) 1

    (B) 0

    (C) 6

    (D) 3

38. Oxidation number of Fe in $[Fe(CO)_{5}]$ is:

    (A) 1

    (B) 2

    (C) 5

    (D) 0

39. Which shows the maximum oxidation state?

    (A) Sc

    (B) Fe

    (C) Zn

    (D) Mn

40. The most stable oxidation state of Chromium is:

    (A) +5

    (B) +3

    (C) +2

    (D) +4

41. यदि एक संक्रमण तत्व का +3 ऑक्सीकरण अवस्था में विन्यास $[Ar]3d^4$ है, तो उसकी परमाणु संख्या क्या होगी? [BSEB, 2026 A]

    (A) 25

    (B) 26

    (C) 22

    (D) 19

42. $Cr_2O_7^{2-}$ ion mein Cr ki oxidation state hai:

    (A) +4

    (B) +5

    (C) +6

    (D) +7

43. Which of the following metals does not liberate hydrogen gas on reaction with dilute acid? [BSEB, 2020 A]

    (A) Fe

    (B) Zn

    (C) Cu

    (D) Mg

44. Which of the following acts as both oxidizing and reducing agent? [BSEB, 2022 A]

    (A) $H_{2}S$

    (B) $H_{2}SO_{4}$

    (C) $SO_{2}$

    (D) $SO_{3}$

45. Which of the following compounds has Mn in +4 state?

    (A) $KMnO_4$

    (B) $K_2MnO_4$

    (C) $MnO_2$

    (D) $Mn_2O_7$

46. Potassium dichromate ($K_2Cr_2O_7$) ek prabal hai:

    (A) Apchayak

    (B) Oxykarak

    (C) Dono ‘A’ aur ‘B’

    (D) None

47. Sankraman tatva (Transition elements) parivartanshil valency dikhate hain kyunki unmein:

    (A) (n-1)d aur ns orbitals ki urja saman hoti hai

    (B) ns orbital poorn bhara hota hai

    (C) Ye metals hain

    (D) Inka size chota hai

48. Which of the following elements show variable valency?

    (A) Group 1 elements

    (B) Group 13 elements

    (C) Group 3 to 11 elements

    (D) Group 18 elements

49. Which transition metal ion is most stable in aqueous solution?

    (A) $Mn^{3+}$

    (B) $Cr^{3+}$

    (C) $V^{3+}$

    (D) $Ti^{3+}$

50. On placing an iron piece in $CuSO_{4}$ solution, the blue color of the solution changes to: [BSEB, 2018 C]

    (A) Black

    (B) Green

    (C) Brown

    (D) Colorless

51. $K_4[Fe(CN)_6]$ mein Fe ki oxidation state hai:

    (A) +2

    (B) +3

    (C) +4

    (D) 0

52. Maximum oxidation state shown by Osmium (Os) is:

    (A) +6

    (B) +7

    (C) +8

    (D) +4

53. Which metal nitrate gives a colorless gas on thermal decomposition? [BSEB, 2018 A]

    (A) $NaNO_{3}$

    (B) $Cu(NO_{3})_{2}$

    (C) $Ba(NO_{3})_{2}$

    (D) $Hg(NO_{3})_{2}$

54. $KMnO_4$ ko amliya madhyam mein apchayit karne par Mn ki oxidation state badal kar ho jati hai:

    (A) +4

    (B) +6

    (C) +2

    (D) 0

Topic 3: Magnetic Properties, Color & Complexes

55. Which of the following ions is diamagnetic? [BSEB, 2025 A]

    (A) $Cr^{2+}$

    (B) $V^{2+}$

    (C) $Sc^{3+}$

    (D) $Ti^{3+}$

56. The number of unpaired electrons in $Cu^{2+}$ (Z = 29) ion is: [BSEB, 2024 A]

    (A) 0

    (B) 1

    (C) 2

    (D) 3

57. Transition metals are generally paramagnetic because of:

    (A) High melting and boiling points

    (B) Presence of vacant d-orbitals

    (C) Presence of unpaired electrons

    (D) Malleability and ductility

58. The magnetic moment ($\mu$) of an ion with 3 unpaired electrons is: [BSEB, 2021 A]

    (A) 2.87 BM

    (B) 3.87 BM

    (C) 4.87 BM

    (D) 5.87 BM

59. The color of $KMnO_{4}$ is due to: [BSEB, 2019 A]

    (A) d-d transition

    (B) Charge transfer spectra

    (C) p-d transition

    (D) None of these

60. $Fe^{2+}$ ion mein ayugmit (unpaired) electronon ki sankhya kitni hai? [BSEB, 2017 A]

    (A) 4

    (B) 5

    (C) 6

    (D) 3

61. Which of the following ions is paramagnetic? [BSEB, 2024 A]

    (A) $Sc^{3+}$

    (B) $Cu^{+}$

    (C) $Zn^{2+}$

    (D) $Cu^{2+}$

62. Which of the following transition metal ions is diamagnetic? [BSEB, 2009 A]

    (A) $Co^{2+}$

    (B) $Ni^{2+}$

    (C) $Cu^{2+}$

    (D) $Zn^{2+}$

63. Which of the following has the maximum magnetic moment?

    (A) $V^{3+}$

    (B) $Cr^{3+}$

    (C) $Fe^{3+}$

    (D) $Co^{3+}$

64. Transition elements form complex compounds because of: [BSEB, 2026 A]

    (A) Small size of ions

    (B) High nuclear charge

    (C) Availability of vacant d-orbitals

    (D) All of the above

65. $Ti^{4+}$ ion ka rang (color) hota hai:

    (A) Hara

    (B) Neela

    (C) Rangheen

    (D) Peela

66. Which of the following has the maximum number of unpaired electrons? [BSEB, 2024 A]

    (A) $Mg^{2+}$

    (B) $Ti^{3+}$

    (C) $V^{3+}$

    (D) $Fe^{3+}$

67. Salts of Chromium are colored because:

    (A) Chromium is a p-block element

    (B) It is a transition element

    (C) It is a Lanthanide element

    (D) It is an Actinide element

68. Which of the following ions is colored? [BSEB, 2013 A]

    (A) $Co^{2+}$

    (B) $Ni^{2+}$

    (C) $Cu^{2+}$

    (D) $Zn^{2+}$

69. The aqueous solution of which ion is colorless? [BSEB, 2019 C]

    (A) $Cu^{1+}$

    (B) $Ag^{1+}$

    (C) $Fe^{2+}$

    (D) $Zn^{2+}$

70. Which of the following transition metal ions is diamagnetic? [BSEB, 2023 A]

    (A) $Ag^{+}$

    (B) $Cu^{2+}$

    (C) $Zn^{2+}$

    (D) $Au^{+}$

71. Which of the following compounds can be colored? [BSEB, 2025 A]

    (A) $Ag_{2}SO_{4}$

    (B) $CuF_{2}$

    (C) $Cu_{2}Cl_{2}$

    (D) $MgF_{2}$

72. The number of unpaired electrons in a molecule of liquid oxygen is: [BSEB, 2025 A]

    (A) 0

    (B) 2

    (C) 3

    (D) 4

73. Which of the following has zero dipole moment? [BSEB, 2025 A]

    (A) $CH_{3}Cl$

    (B) $CCl_{4}$

    (C) $CH_{2}Cl_{2}$

    (D) $CHCl_{3}$

74. Which of the following oxides is paramagnetic? [BSEB, 2025 A]

    (A) $CO_{2}$

    (B) $ClO_{2}$

    (C) $SO_{2}$

    (D) $SiO_{2}$

75. Nimn mein se kaun sa ion rangeen (colored) nahi hai?

    (A) $Ti^{4+}$

    (B) $V^{3+}$

    (C) $Cr^{3+}$

    (D) $Mn^{2+}$

76. $Cu^{2+}$ ion ka neela rang kiske karan hota hai? [BSEB, 2026 A]

    (A) d-d transition

    (B) s-p transition

    (C) Charge transfer

    (D) Inmein se koi nahi

77. Electronic configuration of $Cu^{2+}$ (Z = 29) is: [BSEB, 2023 A]

    (A) $[Ar] 3d^{8} 4s^{1}$

    (B) $[Ar] 3d^{7} 4s^{2}$

    (C) $[Ar] 3d^{9}$

    (D) $[Ar] 3d^{6} 4s^{2} 4p^{1}$

78. Nimn mein se kiski magnetic moment ($\mu$) sabse adhik hogi?

    (A) $d^5$

    (B) $d^2$

    (C) $d^9$

    (D) $d^0$

79. Transition metal ions exhibit color due to:

    (A) Small size

    (B) High charge

    (C) d-d transition

    (D) Metallic bond

80. Magnetic moment of $Ni^{2+}$ (Z=28) is:

    (A) 1.73 BM

    (B) 2.83 BM

    (C) 3.87 BM

    (D) 4.90 BM

81. Which ion has the configuration $[Ar]3d^6$?

    (A) $Fe^{2+}$

    (B) $Co^{3+}$

    (C) Both ‘A’ and ‘B’

    (D) $Ni^{2+}$

82. Magnetic moment is calculated by the formula:

    (A) $\mu = \sqrt{n(n+2)}$

    (B) $\mu = \sqrt{n(n+1)}$

    (C) $\mu = n(n+2)$

    (D) None

83. A substance which is weakly repelled by magnetic field is:

    (A) Paramagnetic

    (B) Diamagnetic

    (C) Ferromagnetic

    (D) None

84. Which of the following transition metal is used as a catalyst in Haber’s process?

    (A) Fe

    (B) Ni

    (C) Pt

    (D) V

Topic 4: Metallurgy, Ores & Alloys

85. Which of the following is called Coinage Metal? [BSEB, 2023 A]

    (A) Fe, Co, and Ni

    (B) Cu and Zn

    (C) Cu, Ag, and Au

    (D) Au and Pt

86. Main components of Brass are:

    (A) Cu and Sn

    (B) Cu and Al

    (C) Cu and Zn

    (D) Cu and Hg

87. Main components of German Silver are:

    (A) Cu, Zn, Ni

    (B) Cu, Zn, Sn

    (C) Ag, Cu, Au

    (D) Fe, Cr, Ni

88. Red lead is: [BSEB, 2016 C]

    (A) $Pb_{3}O_{4}$

    (B) $Pb_{2}O_{3}$

    (C) $PbO$

    (D) $PbO_{2}$

89. The best way to prevent iron from rusting is: [BSEB, 2021 A]

    (A) Making it a cathode

    (B) Putting it in saline water

    (C) Both ‘A’ and ‘B’

    (D) None of these

90. Which of the following is the main impurity found in pig iron?

    (A) Graphite

    (B) O

    (C) S

    (D) Si

91. Main components of Rolled Gold are:

    (A) Cu and Al

    (B) Cu and Sn

    (C) Cu and Zn

    (D) Cu and Cr

92. The percentage of carbon atom in wrought iron (Pitwa Loha) is: [BSEB, 2020 A]

    (A) 0.4%

    (B) .04%

    (C) .02%

    (D) .03%

93. Bell metal is an alloy of:

    (A) Cu + Pb

    (B) Cu + Sn

    (C) Cu + Zn

    (D) Cu + Ni

94. The percentage of carbon atoms in cast iron is:

    (A) 04%

    (B) 06%

    (C) 08%

    (D) 10%

95. Metal found in free state in nature is: [BSEB, 2021 A]

    (A) Gold

    (B) Silver

    (C) Copper

    (D) Sodium

96. Kroll’s process is used for the extraction of:

    (A) Cu

    (B) Ti

    (C) Zn

    (D) Fe

97. Iron (Loha) ka mukhya ayask (ore) hai: [BSEB, 2022 A]

    (A) Magnetite

    (B) Hematite

    (C) Siderite

    (D) Ye sabhi

98. Steel mein carbon ki pratishat (percentage) hoti hai:

    (A) 0.1 se 1.5%

    (B) 5% se 10%

    (C) 10% se 20%

    (D) Inmein se koi nahi

99. Which metal is extracted by Mond’s process?

    (A) Ni

    (B) Fe

    (C) Cu

    (D) Zn

100. Vibrating electrode banane mein kis transition metal ka upyog hota hai?

     (A) Pt

     (B) Pd

     (C) Ni

     (D) W

101. Galvanization is the process of coating iron with:

     (A) Sn

     (B) Zn

     (C) Cu

     (D) Al

102. Stainless steel contains:

     (A) Fe + Cr + Ni

     (B) Fe + C

     (C) Cu + Zn

     (D) Cu + Sn

103. Which of the following is a common property of transition elements?

     (A) They show variable oxidation states

     (B) They are all paramagnetic

     (C) They form complex compounds

     (D) All of the above

104. $FeCl_3$ ka upyog kisme kiya jata hai?

     (A) Etching mein

     (B) Rang banane mein

     (C) Dono ‘A’ aur ‘B’

     (D) Inmein se koi nahi

105. Misch metal ka upyog kisme kiya jata hai?

     (A) Steel banane mein

     (B) Cigarette lighter banane mein

     (C) Rocket fuel mein

     (D) None of these

106. Para (Hg) aur ओजोन ki abhikriya se banta hai: [BSEB, 2026 A]

     (A) HgO

     (B) $HgO_2$

     (C) $Hg_2O$

     (D) None

107. Mercuric chloride reacts with ammonia gas to form a white precipitate: [BSEB, 2018 A]

     (A) $HgCl_{2} \cdot 2NH_{3}$

     (B) $Hg(NH_{3})_{2}Cl_{2}$

     (C) $Hg(NH_{2})Cl$

     (D) $Hg(NH_{2})_{2}Cl$

108. Nessler’s reagent gives a brown ppt with: [BSEB, 2018 A]

     (A) $CO_{2}$

     (B) $NH_{3}$

     (C) $NaCl$

     (D) $KI$

109. When NaCl solution is added to $Fe(OH)_{3}$ sol: [BSEB, 2018 A]

     (A) $[Fe(OH)_{3}]Fe^{3+}$ is obtained

     (B) $[Fe(OH)_{3}]Cl^{-}$ is obtained

     (C) $[Fe(OH)_{3}]Na^{+}$ is obtained

     (D) $Fe(OH)_{3}$ is precipitated

Topic 5: f-Block Elements (Lanthanoids & Actinoids)

110. In which of the following elements, the 4f energy level is gradually filled? [BSEB, 2021 A]

     (A) Lanthanoids

     (B) Actinoids

     (C) Transition metals

     (D) Coinage metals

111. The general electronic configuration of Lanthanide elements is: [BSEB, 2025 A]

     (A) $(n-2)f^{1-14} (n-1)s^{2} p^{6} d^{0,1} ns^{2}$

     (B) $(n-2)f^{0-14} (n-1)d^{10} ns^{2}$

     (C) $(n-2)f^{0-14} (n-1)d^{0,1} ns^{2}$

     (D) $(n-2)d^{0,1} (n-1)f^{0-14} ns^{1}$

112. Electronic configuration of Gadolinium (Z = 64) is: [BSEB, 2023 A]

     (A) $[Xe] 4f^{7} 5d^{1} 6s^{2}$

     (B) $[Xe] 4f^{8} 6s^{2}$

     (C) $[Xe] 4f^{3} 5d^{5} 6s^{2}$

     (D) None of these

113. Lanthanide contraction ka sambandh kiske sath hai?

     (A) Paramanu trijya (Atomic radius)

     (B) Oxidation avastha

     (C) Magnetic moment

     (D) Ionization potential

114. Which of the following is NOT an actinide? [BSEB, 2022 A]

     (A) Curium

     (B) Californium

     (C) Uranium

     (D) Terbium

115. Lutetium (Lu) is: [BSEB, 2025 A]

     (A) A transition element

     (B) A Lanthanide

     (C) An Actinide

     (D) A p-block element

116. The lanthanide contraction is responsible for the fact that:

     (A) Zr and Zn have same radius

     (B) Zr and Hf have about same radius

     (C) Zr and Nb have same radius

     (D) Zr and Y have same radius

117. The number of unpaired electrons in $Lu^{3+}$ is:

     (A) 0

     (B) 1

     (C) 2

     (D) 3

118. Which of the following elements belongs to the actinide series? [BSEB, 2024 A]

     (A) Gd

     (B) Th

     (C) La

     (D) Sm

119. Actinides ki adhiktam (maximum) oxidation state hoti hai:

     (A) +4

     (B) +6

     (C) +7

     (D) +5

120. Which of the following is an ‘Inner Transition’ element?

     (A) Fe

     (B) Au

     (C) Ce

     (D) Hg

121. Lanthanide तत्वों की सबसे सामान्य ऑक्सीकरण अवस्था होती है: [BSEB, 2026 A]

     (A) +2

     (B) +3

     (C) +4

     (D) 0

122. $Zr (Z=40)$ तथा $Hf (Z=72)$ के गुण समान होते हैं क्योंकि: [BSEB, 2026 A]

     (A) वे समान समूह के सदस्य हैं

     (B) लैंथेनाइड संकुचन के कारण उनकी त्रिज्याएँ समान होती हैं

     (C) वे समान ऑक्सीकरण अवस्था प्रदर्शित करते हैं

     (D) None

123. Lanthanum (La) ki paramu sankhya hai:

     (A) 56

     (B) 57

     (C) 58

     (D) 59

124. Transuranic elements kis tatva ke baad aate hain?

     (A) Uranium

     (B) Neptunium

     (C) Plutonium

     (D) Thorium

125. Kosh (shell) jisme 4f electrons bhare jate hain use kehte hain:

     (A) Lanthanide

     (B) Actinide

     (C) Transition

     (D) Noble gas

126. Lanthanoids mein sabse adhiktam paya jane wala tatva hai:

     (A) Lanthanum

     (B) Cerium

     (C) Gadolinium

     (D) Lutetium

127. Common oxidation state of Actinoids is:

     (A) +2

     (B) +3

     (C) +4

     (D) +6

128. Which lanthanide ion is diamagnetic?

     (A) $Ce^{4+}$

     (B) $La^{3+}$

     (C) $Lu^{3+}$

     (D) All of these

129. Promethium (Pm) is a:

     (A) Lanthanoid

     (B) Actinoid

     (C) Transition metal

     (D) Halogen

130. Magnetic properties of Lanthanoids are due to:

     (A) 4f electrons

     (B) 5d electrons

     (C) 6s electrons

     (D) All

131. Which element is used in nuclear reactors?

     (A) U

     (B) Th

     (C) Pu

     (D) All of these

132. Cerium (Z=58) ki +4 oxidation state stable hoti hai kyunki:

     (A) Noble gas configuration

     (B) Half filled orbital

     (C) Small size

     (D) None

133. The last element of Lanthanide series is:

     (A) Lu

     (B) La

     (C) Ce

     (D) Gd

134. Which is not radioactive?

     (A) Curium

     (B) Uranium

     (C) Lanthanum

     (D) Plutonium

135. General configuration of f-block is:

     (A) $(n-2)f^{1-14} (n-1)d^{0-1} ns^2$

     (B) $(n-1)f^{1-14} nd^1 ns^2$

     (C) $(n-2)f^{14} (n-1)d^{10} ns^2$

     (D) None

136. Separation of Lanthanoids is based on:

     (A) Size

     (B) Basicity

     (C) Solubility

     (D) All of these

137. Which is a member of 5f series?

     (A) Th

     (B) U

     (C) Np

     (D) All of these

138. Atomic size of Lanthanoids decreases with increase in atomic number due to:

     (A) Effective nuclear charge increase

     (B) Poor shielding of f-electrons

     (C) Both ‘A’ and ‘B’

     (D) None

139. Most abundant transition metal in Earth’s crust is:

     (A) Al

     (B) Fe

     (C) Cu

     (D) Zn

140. Pratham sankraman shreni (1st Transition Series) mein sabse adhik paya jane wala tatva hai:

     (A) Fe

     (B) Cu

     (C) Cr

     (D) Zn