NEET UG Chemistry D and F Block Elements MCQs

ˆ d-block elements are in periods 4 to 7.

ˆ f-block elements are in periods 6 and 7.

Elements of d-block (Transition metal elements)

ˆ The elements which in their ground state or any one of their oxidation states, d-orbital is

incompletely filled are called transition elements.

ˆ Amongst the d-block elements Zn, Cd and Hg do not act as transition elements.

ˆ All the transition elements are metallic elements.

ˆ In the first transition series, atomic radii decrease from Sc to V, while atomic radius remains same in elements Cr to Cu and the atomic radius of Zn is found increasing instead of decreasing.

ˆ Not much difference is observed in first and second ionization enthalpies of two neighbouring transition elements but the value of second ionization enthalpy of Cr and Cu are more than those of their neighbouring elements.

ˆ Most of the ionic and covalent compounds of transition elements are coloured.

ˆ Compounds of transition elements act as catalysts in certain chemical reactions.

ˆ The magnetic moment of transition element compounds, m = √n (n+2) where m = magnetic moment. n = number of unpaired element The unit of magnetic moment is BM (Bohr Magneton)

ˆ The capacity to form complex compounds is much more than other elements because of definite characteristics of transition elements.

ˆ In the formation of crystals of transition metals, the voids are there in which non-metal elements (H, C, N, B) arrange and form interstitial compounds.

ˆ Scientists Hume and Rothery suggested the rules for the alloys and accordingly alloys having useful properties are obtained from transition metal elements.

ˆ The compounds of transition element- KMnO₄ and K₂Cr₂O₇ are very useful in laboratory and in synthesis of organic compounds.

f-Block elements (Innertransition elements)

ˆ f-Block elements are divided in to (1) Lanthanide series and (2) Actinide series.

Lanthanide series

ˆ Lanthanide series : In period-6 Ce (Z = 58) to Lu (Z = 71)

ˆ Elements of lanthanide series are called lanthanoids which are shown by symbol Ln.

ˆ All the lanthanoids possess stable oxidation state (+3).

ˆ The general electronic configuration of lanthanoids : [Xe]4f^1–145d^0–16s²

ˆ Amongst lanthanoids, promethium (Pm) is radioactive.

Actinide series

ˆ Actinide series : In perod-7 Th (Z = 90) to Lr (Z = 103).

ˆ Elements of actinide series are called actinoids.

ˆ The stable oxidation state in actioids is found to be from (+2) to (+6).

ˆ The general electronic configuration of actinoids is : [Rn]5f^0–146d^0–27s²

ˆ All the actinoids are radioactive.

13. Which of the following does not considered as transition element ?

(A) Cd (B) Pd (C) Ag (D) Ru

 

14. Which of the following does not considered as transition element ?

(A) Au (B) Hg (C) La (D) Pt

 

15. Which of the following does not relevant with transition elements ?

(A) Melting points of transition elements are high.

(B) Some ions of transition elements possesses paramagetic properties.

(C) All transition elements dissolves in acid.

(D) Transition elements processes various oxidation state.

 

 

20. Which elements have low ionisation enthalpy as compare to their neighbour element in first transition element ?

(A) Cr, Cu (B) Cr, Zn (C) Cr, Mn (D) Cu, Zu

 

21. Thermal stability of transition metal elements depends upon which of the following ?

(A) Atomic radii (B) Magnitude of ionisation enthalpy

(C) On electrode potential (D) Shielding effect

 

 

31. In which of the following compound of trantion metal ion has 4.90 BM magnetic momentum?

(A) KMnO₄ (B) NiCl₂ (C) CoCl₂ (D) FeSO₄

 

32. Which of the following sentence is not suitable for the capacity of transition metal to form complex compounds ?

(A) Transition metal ions are small in size.

(B) Nuclear charge of trantion metal ion in comparatively more.

(C) Co-ordination covalent bond is not directional.

(D) Transition metal ions possesses different oxidation states.

 

33. Which of the following rules to prepare alloys should be obey ?

(A) Difference in atomic radii should be less than 15%.

(B) Valence electron configuration should not be equal.

(C) Atomic volume should not same.

(D) Crystal lattice structure are different.

 

34. What is the difference in atomic radii of two metallic elements to prepare alloys ?

(A) 15% (B) more than 15%

(C) less than 15% (D) 24.5 %

 

35. What is the difference of atomic radii of Au and Cu in 22 carate gold ?

(A) 15% (B) more than 15%

(C) less than 15% (D) 24.5%

 

36. Mn, Co, Cu metals are generally useful to prepare alloys because

(A) the difference in their atomic volume is more than 15%.

(B) the difference in their atomic volume is less than 2%.

(C) the difference in their atomic volume is 15%.

(D) the difference in their atomic volume is 2%.

 

37. Which alloy is used in preparation of coins ?

(A) Brass (B) Bronze

(C) German-Silver (D) Nichrome

 

38. Which alloy is used in preparation of antic - piece ?

(A) Nitinol (B) Bronze

(C) Cupronickle (D) German-Silver

 

39. Which alloy possesses facinating property of memory ?

(A) Brass (B) Nitinol

(C) Nichrom (D) Cupronicle

 

 

 

49. Where potasium dicromate is used ?

(A) In leather industry (B) In textile industry

(C) As germiside (D) As bleaching agent in cotton cloths.

 

50. What is atomic volume of Au and Cu in 22 carrate gold ornaments ?

(A) 134 pm 118 pm (B) 133 pm 118 pm

(C) 134 pm 117 pm (D) 135 pm 117 pm

 

 

 

54. Potassium permangnate is used as _____

(A) As reducing agent (B) As corrosion inhibitors

(C) As decolouring agent in textile industry (D) In preparation of azo compound

 

55. Which of following is used in dry cell ?

(A) KMnO₄ (B) MnO₂ (C) K₂ Cr₂ O₇ (D) K₂MnO₂

 

56. Which of alloy is used to fill dental cavities ?

(A) Sodium amalgam (B) Zinc chloride

(C) Mercury (D) Mercury Amalgam

 

57. Which of following is used as gernlicide

(A) K₂Cr₂O₇  (B)KMnO₄  (C) FeSO₄  (D) K₂MnO₄

 

58. Which of following elements are include in Lanthanoide series ?

(A) La to Lu (B) Ce to Lu (C) La to yb (D) Ce to yb

 

59. Which of general symbol is used to represent Lanthanoides ?

(A) Ln (B) La (C) Le (D) Li

 

60. Which of following elements are include in actinide ?

(A) Th to Lr (B) Ac to Lr

(C) Ac to No (D) Th to No

 

 

69. Which of following radioactive elements in Lanthanodies.

(A) Promethium (Pm) (B) Lutetium (Lu)

(C) Yetterbium (Yb (D) Samarium (Sm)

 

70. Which of following is used in gas lighters ?

(A) CeO2 (B) Pyrophoric Misch metal

(C) Gadolinium sulphate (D) Ceric compounds

 

71. Which of following is used as oxidizing agent in volumetric analysis ?

(A) Ceric compounds (B) CeO₂

(C) Oxides of lanthanoids (D) Gadolinium sulphate

 

72. Which of following is used in preparation of optical glass of camera having high refractive index ?

(A) ceric compounds (B) CeO₂

(C) Oxides of lanthanoids (D) Gadolinium sulphate

 

73. Which of following is used to produce very low temperature by magnetic field ?

(A) Pyrophoric misch metal (B) Uranium

(C) Thorium (D) Gadolinium sulphate

 

74. What is the constitution of metals in pyrophoric misch metal ?

(A) ce-50%, ca-40%, Fe-10% (B) Ce-50%, La-40%, Fe-7%, other-5%

(C) Ce-40%, La-50%, Fe-5%, other-5% (D) Ce-40%, La-50%, Fe-10%

 

 

76. Which of following statement is wrong ?

(A) Atoms of all transition elements are paramagnetic.

(B) All transition elements are metals.

(C) All elements of d-block are transition elements.

(D) d-block elements are present in between s & p block elements in periodic table.

 

77. Why do theoritical value of magnetic moment differ from their practical value ?

(A) Due to decrease in volume of metal ion.

(B) Due to unsymmetrical arrangement of dipoles in orbital.

(C) Due to rotation-orbital combination.

(D) Both are different methods to calculate magnetic moment.

 

78. What is the value of magnetic moment of central metal ion in K₂MnO₄ ?

(A) 0.0 BM (B) 1.73 BM

(C) 2.83 BB (D) 3.87 BM

 

 

(A) Y³⁺ , < La³⁺ , < Eu³⁺ , > Lu³⁺ (B) Y³⁺ , < Lu³⁺ , < Eu³⁺ , < La³⁺

(C) Lu³⁺ , < Eu³⁺ , < La³⁺ , < Y³⁺ (D) La³⁺ , < Eu³⁺ , < Lu⁺³ , < Y³⁺

 

118. Lanthanide contraction is observed due to increase in____

(A) Atomic radii (B) Volume of 4f orbital

(C) Effective nuclear charge (D) Atomic number

 

119. In _____ elements, atomic volume decrease with increase in atomic number. 

(A) p-Block (B) f-Block

(C) Radioactive series (D) Super heavy elements

 

120. Which of aqueous solution is coloured ?

(A) Zn (NO₃)₂ (B) LiNO₃ (C) Co (NO₃)₂ (D) Potash Alum