NEET Chemistry The D and F Block Elements MCQs Set A

Question: Which of the following does not have abnormal electronic configuration?

• a) Cr
• b) Pd
• c) Pt
• d) Hg

Answer: Hg

Question: The trend in ionisation enthalpy of a transition element is not regular because

• a) Removal of one electron alters the relative energies of 4s and 3d orbitals
• b) Due to different E.C. (stability)
• c) Poor screening of 3p orbital
• d) Both (1) & (2)

Answer: Removal of one electron alters the relative energies of 4s and 3d orbitals

Question:  The element having lowest IE₁

• a) Fe
• b) Co
• c) Ni
• d) Cu

Answer: Ni

Question:  Choose the correct pair regarding IE₃.

• a) Mn > Cr
• b) Mn > Fe
• c) Zn > Cu
• d) All of these

Answer: All of these

Question: Which of the following element does not show the variable oxidation state?

• a) Fe
• b) Mn
• c) Cu
• d) Zn

Answer: Zn

Question: With F highest stable oxidation state of Mn is

• a) +6
• b) +4
• c) +7
• d) +3

Answer: +4

Question: With O highest possible oxidation state of Mn is

• a) +7
• b) +4
• c) +5
• d) +3

Answer: +7

Question: Oxygen stabilises higher oxidation state because

• a) It is electronegative
• b) Of its tendency to form double bond
• c) Of small size
• d) Of large size

Answer: Of its tendency to form double bond

Question: Which of the following have highest magnetic moment?

• a) Fe²⁺ 
• b) Mn⁺
• c) Fe³⁺
• d) Fe⁺

Answer: Mn⁺

Question:  Reduction potential of M²⁺/M will depend on 

• a) IE₁+ IE₂
• b) ΔH _atomisation
• c) Hydration energy
• d) All of these

Answer: All of these

Question:  Amongst the following ions, which is considered as most stable in M²⁺ state?

• a) Ti²⁺/Ti (–1.63 V)
• b) V²⁺/V (–1.11 V)
• c) Cr²⁺/Cr (–0.90 V) 
• d) Mn²⁺/Mn (1.18 V)

Answer:  Ti²⁺/Ti (–1.63 V)

Question:  Electrode potential of M²⁺/M for Ni is abnormal because of

• a) High IE₁+ IE₂ 
• b) High hydration energy
• c) ΔH _atomisation
• d) Electronic configuration of Ni²⁺

Answer: High hydration energy

Question: Size of lanthanide decrease because of poor screening of

• a) 4f
• b) 3d
• c) 5f
• d) 4d

Answer: 4f

Question: The inner transition element that is radioactive is

• a) Pm
• b) Gd
• c) Lu
• d) Sm

Answer: Pm

More Questions........................................................

Question: The strongest base is

• a) Ce(OH)₃  
• b) Lu(OH)₃
• c) Yb(OH)₃  
• d) Pm(OH)₃

Answer:  Ce(OH)₃  

Question: The lanthanide contraction is responsible for the fact that

• a) Zr and Y have about the same radius
• b) Zr and Nb have similar oxidation state
• c) Zr and Hf have about the same radius
• d) Zr and Zn have the same oxidation state

Answer: Zr and Hf have about the same radius

Question: The element that is not present in misch metal is

• a) La
• b) Iron
• c) Na
• d) Ce

Answer: Na

Question: Most stable oxidation state of Lanthanides

• a) +2
• b) +3
• c) +4
• d) +1

Answer: +3

Question: Which one of the following pairs of ions have same electronic configuration?

• a) Cr³⁺ Fe³⁺
• b) Mn²⁺, Fe³⁺ 
• c) Fe³⁺ Co³⁺
• d) Sc³⁺, Cr³⁺

Answer:  Mn²⁺, Fe³⁺ 

Question: The species which is paramagnetic

• a) Cr⁺
• b) Zn²⁺
• c) Cu⁺
• d) MnO₄^–

Answer:  Cr⁺

Question:  When intimate mixture of potassium dichromate and potassium chloride is heated with conc. H₂SO₄ which of the following is produced in the form of red vapours?

• a) CrO₃ 
• b) Cr₂O₃
• c) CrO₂Cl₂
• d) CrCl₂

Answer: CrO₂Cl₂

Question: Which of the following oxide is basic?

• a) CrO
• b) Cr₂O₃ 
• c) CrO₃
• d) Cr₂O₄

Answer: CrO

Question:

oxidised product of X. X in the above reaction cannot be

• a)

  

• b) Fe²⁺ 
• c)

   

• d) S^2–

Answer:

Question: The reducing nature of any metal in aqueous solution depends upon a. Enthalpy of atomisation b. Ionisation enthalpies c. Hydration energy

• a) a & b only
• b) Only b
• c) b & c only
• d) a, b & c

Answer: a, b & c

Question: The magnetic moment of a transition metal ion is found to be 5.92 BM. The number of unpaired electrons present in it is

• a) 2
• b) 3
• c) 4
• d) 5

Answer: 5

Question: Which of the following is the consequences of lanthanide contraction?

• a) Separation of mixture of lanthanides is difficult
• b) Basic nature of hydroxides decrease from first member to last member of lanthanides
• c) Size of Hf and Zr is different
• d) Both (1) & (2)

Answer: Both (1) & (2)

Question: Which of the following is non-typical transition element?

• a) Ti
• b) Cr
• c) Fe
• d) Sc

Answer: Sc

Question:  n-Factor of KMnO₄ in neutral medium is

• a) 6
• b) 5
• c) 4
• d) 3

Answer: 3

Question:  K₂Cr₂O₇+ I^– + H⁺ —→ Oxidized product. The product is

• a) KIO₃ 
• b) I₂
• c) I₃^–
• d) Cr₂O₃

Answer:  I₂

Question: Which of the following is coloured due to charge transfer?

• a) MnO₄^– 
• b) CrO₄^2–  
• c) Cu₂O
• d) All of these

Answer: All of these

Question: Coinage metals are

• a) Normal metals
• b) Transition metals
• c) Active metals
• d) Highly electropositive

Answer: Transition metals

Question:  Pyrolusite is used to prepare potassium permanganate  X and Y are

• a) Fuse with KOH/air, electrolytic reduction
• b) Fuse with KOH/air, electrolytic oxidation
• c) Fuse with con. HNO₃ /air, electrolytic reduction
• d) All are correct

Answer: Fuse with KOH/air, electrolytic oxidation

Question: Which one of the following exhibits highest oxidation state?

• a) Zr
• b) V
• c) Mn
• d) Ni

Answer: Mn

Question: Ce(Z = 58) and Yb(Z = 70) exhibits stable +4 and +2 oxidation states respectively. This is because

• a) Ce⁴⁺ and Yb²⁺ acquire f⁷ configuration 
• b) Ce⁴⁺ and Yb²⁺ acquire f⁰ configuration
• c) Ce⁴⁺ and Yb²⁺ acquire f⁰ and f¹⁴ configuration
• d) Ce⁴⁺ and Yb²⁺ acquire f⁷ and f¹⁴ configuration

Answer:  Ce⁴⁺ and Yb²⁺ acquire f⁰ and f¹⁴ configuration

Question:   A purple coloured solution is made alkaline with KOH and is treated with KI forming potassium iodate. The same solution is acidified with H₂SO₄ and again it H is treated with KI. However this time instead of potassium iodate, iodine gas is released. The purple coloured solution is of

• a) K₂Cr₂O₇
• b) K₂Cr₂O₄ 
• c) KMnO₄
• d) K₂MnO₄

Answer:  KMnO₄

Question:  FeSO₄ on heating gives

• a) SO₂ and SO₃
• b) SO₂ only 
• c) SO₃ only 
• d) SO₂ and O₂

Answer:  SO₂ and SO₃

Question:  Acidified solution of chromic acid on treatment with H₂O₂ gives blue colour which is due to

• a) CrO₃+ H₂O + O₂   
• b) Cr₂O₃+ H₂O + O₂
• c) CrO₅+ H₂O   
• d) H₂Cr₂O₇+ H₂O + CO₂

Answer:  CrO₅+ H₂O   

Question:  What are the species X and Y in the following?

• a)

  

• b) CrO₃, Cr₂O₃
• c) H₂CrO₄, H₂Cr₂O₇
• d)

  

Answer:

Question: The correct statement

• a) Green vitriol and blue vitriol are isomorphus
• b) KMnO₄ and K2Cr₂O₇ are coloured due to d-d transitions
• c) Cu₂Cl₂ and Ag₂S are coloured
• d) Upon strong heating paramagnetic gases are evolved by NaNO₃ and AgNO₃

Answer:  Upon strong heating paramagnetic gases are evolved by NaNO₃ and AgNO₃

Question: Which oxide of manganese is acidic in nature?

• a) MnO
• b) Mn₂O₇
• c) Mn₂O₃ 
• d) MnO₂

Answer: Mn₂O₇

Question:  The blue colour produced on adding H₂O₂ to acidified K₂Cr₂O₇ is due to the formation of

• a) CrO₅
• b) Cr₂O₃
• c) CrO₄^2— 
• d) CrO₃

Answer: CrO₅

Question: Ammonium dichromate is used in fireworks.The green coloured powder blown in the air is

• a) CrO₃
• b) Cr₂O₃ 
• c) Cr
• d) CrO(O)₂

Answer:  Cr₂O₃ 

Question: Which of the following statement is correct for 3d-transition element?

• a) All the metals except Sc forms 'MO' oxide
• b) All the metals except Zn forms 'MO' oxide
• c) All the metals except Zn and Sc form 'MO' oxide
• d) All the metals except Mn forms 'MO' oxide

Answer: All the metals except Sc forms 'MO' oxide

Question:  4K₂Cr₂O₇—→ 4K₂CrO₄+ 3O₂+ X, in this reaction X is

• a) CrO₃  
• b) Cr₂O₇
• c) Cr₂O₃
• d) CrO₅

Answer: Cr₂O₃

Question: Which of the following is not coloured?

• a) Mn²⁺
• b) Cr³⁺
• c) Zn²⁺
• d) Cu²⁺

Answer:  Zn²⁺ 

Question: Which of the following belongs to group ‘8’?

• a) Ni, Pd, Pt
• b) F, Cl, Br
• c) Fe, Ru, Os
• d) Xe, Ar, Kr

Answer: Fe, Ru, Os

Question:  The equivalent weight of MnSO₄ is equal to its molecular weight when it is converted to

• a) Mn₂O₃
• b) MnO₂
• c) MnO₄^–
• d) MnO₄^2–

Answer:  Mn₂O₃

Question: Which one of the following pairs of ions have same electronic configuration?

• a) Cr³⁺ Fe³⁺
• b) Mn²⁺, Fe³⁺ 
• c) Fe³⁺ Co³⁺ 
• d) Sc³⁺, Cr³⁺

Answer: Mn²⁺, Fe³⁺ 

Question: Transuranic elements begin with

• a) Np
• b) Cm
• c) Pu
• d) U

Answer: Np

Question:  The element which does not show d⁰ configuration in its highest oxidation state

• a) V
• b) Mn
• c) Cr
• d) Fe

Answer: Fe

Question: Gun metal contains

• a) Cu, Sn, Zn
• b) Cu, Ni
• c) Cu, Ni, Fe
• d) Cu, Sn, P

Answer: Cu, Sn, Zn

Question:  The colour of K₂Cr₂O₇ and Fe²⁺ ions are respectively due to

• a) d-d transition and charge transfer spectra
• b) Charge transfer spectra and d-d transition
• c) Crystal defects and charge transfer spectra
• d) Charge transfer spectra and crystal defects

Answer: Charge transfer spectra and d-d transition

Question:  CrO₃ is coloured due to

• a) Crystal defect
• b) Unpaired electrons
• c) Charge transfer spectra
• d) Low I.E.

Answer: Charge transfer spectra

Question:  Which of the following occur when AgNO₃ becomes, red hot?

• a) 2AgNO₃—→ 2Ag + 2NO₂+ O₂
• b) AgNO₃—→ Ag + NO + O₂   
• c) 2AgNO₃—→ AgNO₂+ O₂
• d) 2AgNO₃—→ 2Ag + N₂+ 3O₂

Answer:  2AgNO₃—→ 2Ag + 2NO₂+ O₂

Question: Which one alloy does not contain copper?

• a) Bronze
• b) Brass
• c) German silver
• d) Mischmetal

Answer: Mischmetal

Question: The metal which can form cation having metal - metal bond

• a) Mercury
• b) Copper
• c) Osmium
• d) Iron

Answer: Mercury

Question: Value of magnetic moment of a divalent metal ion is 5.92 BM. Total number of electron in its atom would be

• a) 24
• b) 25
• c) 26
• d) 27

Answer: 25

Question: In black and white photography, the developed film is fixed by washing with

• a) AgBr solution
• b) Hypo solution
• c) Na₂S₄O₆ solution
• d) FeC₂O₄ solution

Answer: Hypo solution

Question: Gold dissolves in aqua regia to give

• a) H[AuCl₄]
• b) AuNO₃ 
• c) H₂[AuCl₆] 
• d) Au(NO₃)₃

Answer: H[AuCl₄]

Question: Which of the following belongs to group ‘8’?

• a) Ni, Pd, Pt
• b) F, Cl, Br
• c) Fe, Ru, Os
• d) Xe, Ar, Kr

Answer: Fe, Ru, Os