D & F - Block NCERT EXEMPLAR JEE Notes | EduRev

JEE : D & F - Block NCERT EXEMPLAR JEE Notes | EduRev

 Page 1


1. Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d
5
. What is its atomic number?
(i) 25
(ii) 26
(iii) 27
(iv) 24
2. The electronic configuration of Cu(II) is 3d
9
 whereas that of Cu(I) is 3d
10
.  Which
of the following is correct?
(i) Cu(II) is more stable
(ii) Cu(II) is less stable
(iii) Cu(I) and Cu(II) are equally stable
(iv) Stability of Cu(I) and Cu(II) depends on nature of copper salts
3. Metallic radii of some transition elements are given below. Which of these
elements will have highest density?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128
(i) Fe
(ii) Ni
(iii) Co
(iv) Cu
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
8
8
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
© NCERT
not to be republished
Page 2


1. Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d
5
. What is its atomic number?
(i) 25
(ii) 26
(iii) 27
(iv) 24
2. The electronic configuration of Cu(II) is 3d
9
 whereas that of Cu(I) is 3d
10
.  Which
of the following is correct?
(i) Cu(II) is more stable
(ii) Cu(II) is less stable
(iii) Cu(I) and Cu(II) are equally stable
(iv) Stability of Cu(I) and Cu(II) depends on nature of copper salts
3. Metallic radii of some transition elements are given below. Which of these
elements will have highest density?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128
(i) Fe
(ii) Ni
(iii) Co
(iv) Cu
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
8
8
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
© NCERT
not to be republished
106 Exemplar Problems, Chemistry
4. Generally transition elements form coloured salts due to the presence of
unpaired electrons. Which of the following compounds will be coloured in
solid state?
(i) Ag
2
SO
4
(ii) CuF
2
(iii) ZnF
2
(iv) Cu
2
Cl
2
5. On addition of small amount of KMnO
4
 to concentrated H
2
SO
4
, a green oily
compound is obtained which is highly explosive in nature. Identify the
compound from the following.
(i) Mn
2
O
7
(ii) MnO
2
(iii) MnSO
4
(iv) Mn
2
O
3
6. The magnetic nature of elements depends on the presence of unpaired
electrons. Identify the configuration of transition element, which shows highest
magnetic moment.
(i) 3d
7
(ii) 3d
5
(iii) 3d
8
(iv) 3d
2
7. Which of the following oxidation state is common for all lanthanoids?
(i) +2
(ii) +3
(iii) +4
(iv) +5
8. Which of the following reactions are disproportionation reactions?
(a) Cu
+
 ?? Cu
2+
 + Cu
(b) 3MnO
4
–
 + 4H
+
 ?? 2MnO
4
–
  + MnO
2
 + 2H
2
O
(c) 2KMnO
4
  ?? K
2
MnO
4
  + MnO
2
 + O
2
(d) 2MnO
4
–
 + 3Mn
2+
 + 2H
2
O ?? 5MnO
2
 + 4H
+
(i) a, b
(ii) a, b, c
(iii) b, c, d
(iv) a, d
© NCERT
not to be republished
Page 3


1. Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d
5
. What is its atomic number?
(i) 25
(ii) 26
(iii) 27
(iv) 24
2. The electronic configuration of Cu(II) is 3d
9
 whereas that of Cu(I) is 3d
10
.  Which
of the following is correct?
(i) Cu(II) is more stable
(ii) Cu(II) is less stable
(iii) Cu(I) and Cu(II) are equally stable
(iv) Stability of Cu(I) and Cu(II) depends on nature of copper salts
3. Metallic radii of some transition elements are given below. Which of these
elements will have highest density?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128
(i) Fe
(ii) Ni
(iii) Co
(iv) Cu
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
8
8
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
© NCERT
not to be republished
106 Exemplar Problems, Chemistry
4. Generally transition elements form coloured salts due to the presence of
unpaired electrons. Which of the following compounds will be coloured in
solid state?
(i) Ag
2
SO
4
(ii) CuF
2
(iii) ZnF
2
(iv) Cu
2
Cl
2
5. On addition of small amount of KMnO
4
 to concentrated H
2
SO
4
, a green oily
compound is obtained which is highly explosive in nature. Identify the
compound from the following.
(i) Mn
2
O
7
(ii) MnO
2
(iii) MnSO
4
(iv) Mn
2
O
3
6. The magnetic nature of elements depends on the presence of unpaired
electrons. Identify the configuration of transition element, which shows highest
magnetic moment.
(i) 3d
7
(ii) 3d
5
(iii) 3d
8
(iv) 3d
2
7. Which of the following oxidation state is common for all lanthanoids?
(i) +2
(ii) +3
(iii) +4
(iv) +5
8. Which of the following reactions are disproportionation reactions?
(a) Cu
+
 ?? Cu
2+
 + Cu
(b) 3MnO
4
–
 + 4H
+
 ?? 2MnO
4
–
  + MnO
2
 + 2H
2
O
(c) 2KMnO
4
  ?? K
2
MnO
4
  + MnO
2
 + O
2
(d) 2MnO
4
–
 + 3Mn
2+
 + 2H
2
O ?? 5MnO
2
 + 4H
+
(i) a, b
(ii) a, b, c
(iii) b, c, d
(iv) a, d
© NCERT
not to be republished
107 d- and f- Block Elements
9. When KMnO
4
 solution is added to oxalic acid solution, the decolourisation is
slow in the beginning but becomes instantaneous after some time because
(i) CO
2
 is formed as the product.
(ii) Reaction is exothermic.
(iii) MnO
4
–
 catalyses the reaction.
(iv) Mn
2+
 acts as autocatalyst.
10. There are 14 elements in actinoid series. Which of the following elements does
not belong to this series?
(i) U
(ii) Np
(iii) Tm
(iv) Fm
11. KMnO
4
 acts as an oxidising agent in acidic medium. The number of moles of
KMnO
4
 that will be needed to react with one mole of sulphide ions in acidic
solution is
(i)
2
5
(ii)
3
5
(iii)
4
5
(iv)
1
5
12. Which of the following is amphoteric oxide?
Mn
2
O
7
, CrO
3
, Cr
2
O
3
, CrO, V
2
O
5
, V
2
O
4
(i) V
2
O
5
, Cr
2
O
3
(ii) Mn
2
O
7
, CrO
3
(iii) CrO, V
2
O
5
(iv) V
2
O
5
, V
2
O
4
13. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the
following is the correct electronic configuration of gadolinium?
(i) [Xe] 4f 
7
5d
1
6s
2
(ii) [Xe] 4f 
6
5d
2
6s
2
(iii) [Xe] 4f 
8
6d
2
(iv) [Xe] 4f 
9
5s
1
© NCERT
not to be republished
Page 4


1. Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d
5
. What is its atomic number?
(i) 25
(ii) 26
(iii) 27
(iv) 24
2. The electronic configuration of Cu(II) is 3d
9
 whereas that of Cu(I) is 3d
10
.  Which
of the following is correct?
(i) Cu(II) is more stable
(ii) Cu(II) is less stable
(iii) Cu(I) and Cu(II) are equally stable
(iv) Stability of Cu(I) and Cu(II) depends on nature of copper salts
3. Metallic radii of some transition elements are given below. Which of these
elements will have highest density?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128
(i) Fe
(ii) Ni
(iii) Co
(iv) Cu
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
8
8
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
© NCERT
not to be republished
106 Exemplar Problems, Chemistry
4. Generally transition elements form coloured salts due to the presence of
unpaired electrons. Which of the following compounds will be coloured in
solid state?
(i) Ag
2
SO
4
(ii) CuF
2
(iii) ZnF
2
(iv) Cu
2
Cl
2
5. On addition of small amount of KMnO
4
 to concentrated H
2
SO
4
, a green oily
compound is obtained which is highly explosive in nature. Identify the
compound from the following.
(i) Mn
2
O
7
(ii) MnO
2
(iii) MnSO
4
(iv) Mn
2
O
3
6. The magnetic nature of elements depends on the presence of unpaired
electrons. Identify the configuration of transition element, which shows highest
magnetic moment.
(i) 3d
7
(ii) 3d
5
(iii) 3d
8
(iv) 3d
2
7. Which of the following oxidation state is common for all lanthanoids?
(i) +2
(ii) +3
(iii) +4
(iv) +5
8. Which of the following reactions are disproportionation reactions?
(a) Cu
+
 ?? Cu
2+
 + Cu
(b) 3MnO
4
–
 + 4H
+
 ?? 2MnO
4
–
  + MnO
2
 + 2H
2
O
(c) 2KMnO
4
  ?? K
2
MnO
4
  + MnO
2
 + O
2
(d) 2MnO
4
–
 + 3Mn
2+
 + 2H
2
O ?? 5MnO
2
 + 4H
+
(i) a, b
(ii) a, b, c
(iii) b, c, d
(iv) a, d
© NCERT
not to be republished
107 d- and f- Block Elements
9. When KMnO
4
 solution is added to oxalic acid solution, the decolourisation is
slow in the beginning but becomes instantaneous after some time because
(i) CO
2
 is formed as the product.
(ii) Reaction is exothermic.
(iii) MnO
4
–
 catalyses the reaction.
(iv) Mn
2+
 acts as autocatalyst.
10. There are 14 elements in actinoid series. Which of the following elements does
not belong to this series?
(i) U
(ii) Np
(iii) Tm
(iv) Fm
11. KMnO
4
 acts as an oxidising agent in acidic medium. The number of moles of
KMnO
4
 that will be needed to react with one mole of sulphide ions in acidic
solution is
(i)
2
5
(ii)
3
5
(iii)
4
5
(iv)
1
5
12. Which of the following is amphoteric oxide?
Mn
2
O
7
, CrO
3
, Cr
2
O
3
, CrO, V
2
O
5
, V
2
O
4
(i) V
2
O
5
, Cr
2
O
3
(ii) Mn
2
O
7
, CrO
3
(iii) CrO, V
2
O
5
(iv) V
2
O
5
, V
2
O
4
13. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the
following is the correct electronic configuration of gadolinium?
(i) [Xe] 4f 
7
5d
1
6s
2
(ii) [Xe] 4f 
6
5d
2
6s
2
(iii) [Xe] 4f 
8
6d
2
(iv) [Xe] 4f 
9
5s
1
© NCERT
not to be republished
108 Exemplar Problems, Chemistry
14. Interstitial compounds are formed when small atoms are trapped inside the
crystal lattice of metals. Which of the following is not the characteristic property
of interstitial compounds?
(i) They have high melting points in comparison to pure metals.
(ii) They are very hard.
(iii) They retain metallic conductivity.
(iv) They are chemically very reactive.
15. The magnetic moment is associated with its spin angular momentum and
orbital angular momentum. Spin only magnetic moment value of Cr
3+
 ion is
___________.
(i) 2.87 B.M.
(ii) 3.87 B.M.
(iii) 3.47 B.M.
(iv) 3.57 B.M.
16. KMnO
4
 acts as an oxidising agent in alkaline medium. When alkaline KMnO
4
is treated with KI, iodide ion  is oxidised to  ____________.
(i) I
2
(ii) IO
–
(iii) IO
3
–
(iv) IO
4
–
17. Which of the following statements is not correct?
(i) Copper liberates hydrogen from acids.
(ii) In its higher oxidation states,  manganese forms stable compounds with
oxygen and fluorine.
(iii) Mn
3+
 and Co
3+
 are oxidising agents in aqueous solution.
(iv) Ti
2+
 and Cr
2+
 are reducing agents in aqueous solution.
18. When acidified K
2
Cr
2
O
7
 solution is added to Sn
2+
 salts then Sn
2+
 changes to
(i) Sn
(ii) Sn
3+
(iii) Sn
4+
(iv) Sn
+
19. Highest oxidation state of manganese in fluoride is +4 (MnF
4
) but highest
oxidation state in oxides is +7 (Mn
2
O
7
) because ____________.
(i) fluorine is more electronegative than oxygen.
(ii) fluorine does not possess d-orbitals.
(iii) fluorine stabilises lower oxidation state.
(iv) in covalent compounds fluorine can form single bond only while oxygen
forms double bond.
© NCERT
not to be republished
Page 5


1. Electronic configuration of a transition element X in +3 oxidation state is
[Ar]3d
5
. What is its atomic number?
(i) 25
(ii) 26
(iii) 27
(iv) 24
2. The electronic configuration of Cu(II) is 3d
9
 whereas that of Cu(I) is 3d
10
.  Which
of the following is correct?
(i) Cu(II) is more stable
(ii) Cu(II) is less stable
(iii) Cu(I) and Cu(II) are equally stable
(iv) Stability of Cu(I) and Cu(II) depends on nature of copper salts
3. Metallic radii of some transition elements are given below. Which of these
elements will have highest density?
Element Fe Co Ni Cu
Metallic radii/pm 126 125 125 128
(i) Fe
(ii) Ni
(iii) Co
(iv) Cu
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
8
8
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
The d The d The d The d The d- and - and - and - and - and f- f- f- f- f- Block Block Block Block Block
Element Element Element Element Elements s s s s
© NCERT
not to be republished
106 Exemplar Problems, Chemistry
4. Generally transition elements form coloured salts due to the presence of
unpaired electrons. Which of the following compounds will be coloured in
solid state?
(i) Ag
2
SO
4
(ii) CuF
2
(iii) ZnF
2
(iv) Cu
2
Cl
2
5. On addition of small amount of KMnO
4
 to concentrated H
2
SO
4
, a green oily
compound is obtained which is highly explosive in nature. Identify the
compound from the following.
(i) Mn
2
O
7
(ii) MnO
2
(iii) MnSO
4
(iv) Mn
2
O
3
6. The magnetic nature of elements depends on the presence of unpaired
electrons. Identify the configuration of transition element, which shows highest
magnetic moment.
(i) 3d
7
(ii) 3d
5
(iii) 3d
8
(iv) 3d
2
7. Which of the following oxidation state is common for all lanthanoids?
(i) +2
(ii) +3
(iii) +4
(iv) +5
8. Which of the following reactions are disproportionation reactions?
(a) Cu
+
 ?? Cu
2+
 + Cu
(b) 3MnO
4
–
 + 4H
+
 ?? 2MnO
4
–
  + MnO
2
 + 2H
2
O
(c) 2KMnO
4
  ?? K
2
MnO
4
  + MnO
2
 + O
2
(d) 2MnO
4
–
 + 3Mn
2+
 + 2H
2
O ?? 5MnO
2
 + 4H
+
(i) a, b
(ii) a, b, c
(iii) b, c, d
(iv) a, d
© NCERT
not to be republished
107 d- and f- Block Elements
9. When KMnO
4
 solution is added to oxalic acid solution, the decolourisation is
slow in the beginning but becomes instantaneous after some time because
(i) CO
2
 is formed as the product.
(ii) Reaction is exothermic.
(iii) MnO
4
–
 catalyses the reaction.
(iv) Mn
2+
 acts as autocatalyst.
10. There are 14 elements in actinoid series. Which of the following elements does
not belong to this series?
(i) U
(ii) Np
(iii) Tm
(iv) Fm
11. KMnO
4
 acts as an oxidising agent in acidic medium. The number of moles of
KMnO
4
 that will be needed to react with one mole of sulphide ions in acidic
solution is
(i)
2
5
(ii)
3
5
(iii)
4
5
(iv)
1
5
12. Which of the following is amphoteric oxide?
Mn
2
O
7
, CrO
3
, Cr
2
O
3
, CrO, V
2
O
5
, V
2
O
4
(i) V
2
O
5
, Cr
2
O
3
(ii) Mn
2
O
7
, CrO
3
(iii) CrO, V
2
O
5
(iv) V
2
O
5
, V
2
O
4
13. Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the
following is the correct electronic configuration of gadolinium?
(i) [Xe] 4f 
7
5d
1
6s
2
(ii) [Xe] 4f 
6
5d
2
6s
2
(iii) [Xe] 4f 
8
6d
2
(iv) [Xe] 4f 
9
5s
1
© NCERT
not to be republished
108 Exemplar Problems, Chemistry
14. Interstitial compounds are formed when small atoms are trapped inside the
crystal lattice of metals. Which of the following is not the characteristic property
of interstitial compounds?
(i) They have high melting points in comparison to pure metals.
(ii) They are very hard.
(iii) They retain metallic conductivity.
(iv) They are chemically very reactive.
15. The magnetic moment is associated with its spin angular momentum and
orbital angular momentum. Spin only magnetic moment value of Cr
3+
 ion is
___________.
(i) 2.87 B.M.
(ii) 3.87 B.M.
(iii) 3.47 B.M.
(iv) 3.57 B.M.
16. KMnO
4
 acts as an oxidising agent in alkaline medium. When alkaline KMnO
4
is treated with KI, iodide ion  is oxidised to  ____________.
(i) I
2
(ii) IO
–
(iii) IO
3
–
(iv) IO
4
–
17. Which of the following statements is not correct?
(i) Copper liberates hydrogen from acids.
(ii) In its higher oxidation states,  manganese forms stable compounds with
oxygen and fluorine.
(iii) Mn
3+
 and Co
3+
 are oxidising agents in aqueous solution.
(iv) Ti
2+
 and Cr
2+
 are reducing agents in aqueous solution.
18. When acidified K
2
Cr
2
O
7
 solution is added to Sn
2+
 salts then Sn
2+
 changes to
(i) Sn
(ii) Sn
3+
(iii) Sn
4+
(iv) Sn
+
19. Highest oxidation state of manganese in fluoride is +4 (MnF
4
) but highest
oxidation state in oxides is +7 (Mn
2
O
7
) because ____________.
(i) fluorine is more electronegative than oxygen.
(ii) fluorine does not possess d-orbitals.
(iii) fluorine stabilises lower oxidation state.
(iv) in covalent compounds fluorine can form single bond only while oxygen
forms double bond.
© NCERT
not to be republished
109 d- and f- Block Elements
20. Although Zirconium belongs to 4d transition series and Hafnium to 5d
transition series even then they show similar physical and chemical properties
because___________.
(i) both belong to d-block.
(ii) both have same number of electrons.
(iii) both have similar atomic radius.
(iv) both belong to the same group of the periodic table.
21. Why is HCl not used to make the medium acidic in oxidation reactions of
KMnO
4
 in acidic medium?
(i) Both HCl and KMnO
4
 act as oxidising agents.
(ii) KMnO
4
 oxidises HCl into Cl
2
 which is also an oxidising agent.
(iii) KMnO
4
 is a weaker oxidising agent than HCl.
(iv) KMnO
4
 acts as a reducing agent in the presence of HCl.
II. Multiple Choice Questions (Type-II)
Note : In the following questions two or more options may be correct.
22. Generally transition elements and their salts are coloured due to the presence
of unpaired electrons in metal ions. Which of the following compounds are
coloured?
(i) KMnO
4
(ii) Ce (SO
4
)
2
(iii) TiCl
4
(iv) Cu
2
Cl
2
23. Transition elements show magnetic moment due to spin and orbital motion
of electrons. Which of the following metallic ions have almost same spin only
magnetic moment?
(i) Co
2+
(ii) Cr
2+
(iii) Mn
2+
(iv) Cr
3+
24. In the form of dichromate, Cr (VI) is a strong oxidising agent in acidic medium
but Mo (VI) in MoO
3
 and W (VI) in WO
3
 are not because ___________.
(i) Cr (VI) is more stable than Mo(VI) and W(VI).
(ii) Mo(VI) and W(VI) are more stable than Cr(VI).
(iii) Higher oxidation states of heavier members of group-6 of transition
series are more stable.
(iv) Lower oxidation states of heavier members of group-6 of transition series
are more stable.
© NCERT
not to be republished
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