the d- and f- Block Elements Practice Questions - DPP for JEE

 Page 1


1. Of the following outer electronic configurations of atoms, the highest
oxidation state is achieved by which one of them
?
(a) (n – 1)d
3
 ns
2
(b) (n – 1)d
5
 ns
1
(c) (n – 1)d
8
 ns
2
(d) (n – 1)d
5
 ns
2
2. In which of the following cases, the stability of two oxidation states is
correctly represented
(a) Ti
3+
 > Ti
4+
(b) Mn
2+
 > Mn
3+
(c) Fe
2+
 > Fe
3+
(d) Cu
+
 > Cu
2+
? 3. Which one of the elements with the following outer orbital
configurations may exhibit the largest number of oxidation states?
Page 2


1. Of the following outer electronic configurations of atoms, the highest
oxidation state is achieved by which one of them
?
(a) (n – 1)d
3
 ns
2
(b) (n – 1)d
5
 ns
1
(c) (n – 1)d
8
 ns
2
(d) (n – 1)d
5
 ns
2
2. In which of the following cases, the stability of two oxidation states is
correctly represented
(a) Ti
3+
 > Ti
4+
(b) Mn
2+
 > Mn
3+
(c) Fe
2+
 > Fe
3+
(d) Cu
+
 > Cu
2+
? 3. Which one of the elements with the following outer orbital
configurations may exhibit the largest number of oxidation states?
(a) 3d
5
4s
1
(b) 3d
5
4s
2
(c) 3d
2
4s
2
(d) 3d
3
4s
2
4. The catalytic activity of transition metals and their compounds is
mainly due to :
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity
5. Arrange Ce
3+
, La
3+
, Pm
3+
 and Yb
3+
 in increasing order of their ionic
radii.
(a) Yb
3+
 < Pm
3+
 < Ce
3+
 < La
3+
(b) Ce
3+
 < Yb
3+
  < Pm
3+
 < La
3+
(c) Yb
3+
 < Pm
3+
 < La
3+
 < Ce
3+
(d) Pm
3+ 
< La
3+ 
< Ce
3+ 
< Yb
3+
6. What would happen when a solution of potassium chromate is treated
with an excess of dilute nitric acid?
(a) and H
2
O are formed
(b) is reduced to +3 state of Cr
(c) is oxidized to +7 state of Cr
(d) Cr
3+
 and  are formed
7. On the basis of data given below,
, 
,  
Which of the following statements is incorrect?
(a) Sc
3+
 has good stability due of [Ar]3d
0
4s
0
 configuration.
(b) Mn
3+
 is more stable than Mn
2+
.
Page 3


1. Of the following outer electronic configurations of atoms, the highest
oxidation state is achieved by which one of them
?
(a) (n – 1)d
3
 ns
2
(b) (n – 1)d
5
 ns
1
(c) (n – 1)d
8
 ns
2
(d) (n – 1)d
5
 ns
2
2. In which of the following cases, the stability of two oxidation states is
correctly represented
(a) Ti
3+
 > Ti
4+
(b) Mn
2+
 > Mn
3+
(c) Fe
2+
 > Fe
3+
(d) Cu
+
 > Cu
2+
? 3. Which one of the elements with the following outer orbital
configurations may exhibit the largest number of oxidation states?
(a) 3d
5
4s
1
(b) 3d
5
4s
2
(c) 3d
2
4s
2
(d) 3d
3
4s
2
4. The catalytic activity of transition metals and their compounds is
mainly due to :
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity
5. Arrange Ce
3+
, La
3+
, Pm
3+
 and Yb
3+
 in increasing order of their ionic
radii.
(a) Yb
3+
 < Pm
3+
 < Ce
3+
 < La
3+
(b) Ce
3+
 < Yb
3+
  < Pm
3+
 < La
3+
(c) Yb
3+
 < Pm
3+
 < La
3+
 < Ce
3+
(d) Pm
3+ 
< La
3+ 
< Ce
3+ 
< Yb
3+
6. What would happen when a solution of potassium chromate is treated
with an excess of dilute nitric acid?
(a) and H
2
O are formed
(b) is reduced to +3 state of Cr
(c) is oxidized to +7 state of Cr
(d) Cr
3+
 and  are formed
7. On the basis of data given below,
, 
,  
Which of the following statements is incorrect?
(a) Sc
3+
 has good stability due of [Ar]3d
0
4s
0
 configuration.
(b) Mn
3+
 is more stable than Mn
2+
.
(c) Cr
2+
 is reducing in nature.
(d) Copper does not give H
2
 on reaction with dil. H
2
SO
4
.
8. When KMnO
4
 acts as an oxidising agent and ultimately forms
[MnO
4
]
1–
, MnO
2
, Mn
2
O
3
, Mn
2+
 then the number of electrons transferred
in each case respectively is
(a) 4, 3, 1, 5
(b) 1, 5, 3, 7
(c) 1, 3, 4, 5
(d) 3, 5, 7, 1
9. For which of the following species d-d transition does not account for
its colour ?
(a)
(b)
(c)
(d) All
10. The “spin-only” magnetic moment [in units of Bohr magneton, (µ
B
)] of
Ni
2+
 in aqueous solution would be (At. No. Ni  = 28)
(a) 6
(b) 1.73
(c) 2.82
(d) 4.90
11. In which of the following lanthanides oxidation state +2 is most stable?
(a) Ce
(b) Eu
(c) Tb
(d) Dy
12. Which one of the following nitrates will leave behind a metal on strong
Page 4


1. Of the following outer electronic configurations of atoms, the highest
oxidation state is achieved by which one of them
?
(a) (n – 1)d
3
 ns
2
(b) (n – 1)d
5
 ns
1
(c) (n – 1)d
8
 ns
2
(d) (n – 1)d
5
 ns
2
2. In which of the following cases, the stability of two oxidation states is
correctly represented
(a) Ti
3+
 > Ti
4+
(b) Mn
2+
 > Mn
3+
(c) Fe
2+
 > Fe
3+
(d) Cu
+
 > Cu
2+
? 3. Which one of the elements with the following outer orbital
configurations may exhibit the largest number of oxidation states?
(a) 3d
5
4s
1
(b) 3d
5
4s
2
(c) 3d
2
4s
2
(d) 3d
3
4s
2
4. The catalytic activity of transition metals and their compounds is
mainly due to :
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity
5. Arrange Ce
3+
, La
3+
, Pm
3+
 and Yb
3+
 in increasing order of their ionic
radii.
(a) Yb
3+
 < Pm
3+
 < Ce
3+
 < La
3+
(b) Ce
3+
 < Yb
3+
  < Pm
3+
 < La
3+
(c) Yb
3+
 < Pm
3+
 < La
3+
 < Ce
3+
(d) Pm
3+ 
< La
3+ 
< Ce
3+ 
< Yb
3+
6. What would happen when a solution of potassium chromate is treated
with an excess of dilute nitric acid?
(a) and H
2
O are formed
(b) is reduced to +3 state of Cr
(c) is oxidized to +7 state of Cr
(d) Cr
3+
 and  are formed
7. On the basis of data given below,
, 
,  
Which of the following statements is incorrect?
(a) Sc
3+
 has good stability due of [Ar]3d
0
4s
0
 configuration.
(b) Mn
3+
 is more stable than Mn
2+
.
(c) Cr
2+
 is reducing in nature.
(d) Copper does not give H
2
 on reaction with dil. H
2
SO
4
.
8. When KMnO
4
 acts as an oxidising agent and ultimately forms
[MnO
4
]
1–
, MnO
2
, Mn
2
O
3
, Mn
2+
 then the number of electrons transferred
in each case respectively is
(a) 4, 3, 1, 5
(b) 1, 5, 3, 7
(c) 1, 3, 4, 5
(d) 3, 5, 7, 1
9. For which of the following species d-d transition does not account for
its colour ?
(a)
(b)
(c)
(d) All
10. The “spin-only” magnetic moment [in units of Bohr magneton, (µ
B
)] of
Ni
2+
 in aqueous solution would be (At. No. Ni  = 28)
(a) 6
(b) 1.73
(c) 2.82
(d) 4.90
11. In which of the following lanthanides oxidation state +2 is most stable?
(a) Ce
(b) Eu
(c) Tb
(d) Dy
12. Which one of the following nitrates will leave behind a metal on strong
heating ?
(a) Copper nitrate
(b) Manganese nitrate
(c) Silver nitrate
(d) Ferric nitrate
13. The black compound formed during the reaction between
sodium thiosulphate and silver nitrate is
(a) silver thiosulphate 
(b) silver sulphide 
(c) silver sulphate 
(d) silver sulphite 
14. Which of the following arrangements does not represent the correct
order of the property stated against it ?
(a) V
2+
 < Cr
2+
 < Mn
2+
 < Fe
2+
 : paramagnetic behaviour
(b) Ni
2+
 < Co
2+
 < Fe
2+
 < Mn
2+
 : ionic size
(c) Co
3+
 < Fe
3+
 < Cr
3+
 < Sc
3+
 : stability in aqueous solution
(d) Sc < Ti < Cr < Mn : number of oxidation states
15. Which of the following factors may be regarded as the main cause of
lanthanoide contraction?
(a) Greater shielding of 5d electrons by 4f electrons.
(b) Poorer shielding of 5d electrons by 4f electrons.
(c) Effective shielding of one of 4f electrons by another in the subshell.
(d) Poor shielding of one of 4f electron by another in the subshell.
16. Which of the following elements shows maximum number of different
oxidation states in its compounds?
(a) Eu
(b) Ld
(c) Gd
(d) Am
Page 5


1. Of the following outer electronic configurations of atoms, the highest
oxidation state is achieved by which one of them
?
(a) (n – 1)d
3
 ns
2
(b) (n – 1)d
5
 ns
1
(c) (n – 1)d
8
 ns
2
(d) (n – 1)d
5
 ns
2
2. In which of the following cases, the stability of two oxidation states is
correctly represented
(a) Ti
3+
 > Ti
4+
(b) Mn
2+
 > Mn
3+
(c) Fe
2+
 > Fe
3+
(d) Cu
+
 > Cu
2+
? 3. Which one of the elements with the following outer orbital
configurations may exhibit the largest number of oxidation states?
(a) 3d
5
4s
1
(b) 3d
5
4s
2
(c) 3d
2
4s
2
(d) 3d
3
4s
2
4. The catalytic activity of transition metals and their compounds is
mainly due to :
(a) their magnetic behaviour
(b) their unfilled d-orbitals
(c) their ability to adopt variable oxidation state
(d) their chemical reactivity
5. Arrange Ce
3+
, La
3+
, Pm
3+
 and Yb
3+
 in increasing order of their ionic
radii.
(a) Yb
3+
 < Pm
3+
 < Ce
3+
 < La
3+
(b) Ce
3+
 < Yb
3+
  < Pm
3+
 < La
3+
(c) Yb
3+
 < Pm
3+
 < La
3+
 < Ce
3+
(d) Pm
3+ 
< La
3+ 
< Ce
3+ 
< Yb
3+
6. What would happen when a solution of potassium chromate is treated
with an excess of dilute nitric acid?
(a) and H
2
O are formed
(b) is reduced to +3 state of Cr
(c) is oxidized to +7 state of Cr
(d) Cr
3+
 and  are formed
7. On the basis of data given below,
, 
,  
Which of the following statements is incorrect?
(a) Sc
3+
 has good stability due of [Ar]3d
0
4s
0
 configuration.
(b) Mn
3+
 is more stable than Mn
2+
.
(c) Cr
2+
 is reducing in nature.
(d) Copper does not give H
2
 on reaction with dil. H
2
SO
4
.
8. When KMnO
4
 acts as an oxidising agent and ultimately forms
[MnO
4
]
1–
, MnO
2
, Mn
2
O
3
, Mn
2+
 then the number of electrons transferred
in each case respectively is
(a) 4, 3, 1, 5
(b) 1, 5, 3, 7
(c) 1, 3, 4, 5
(d) 3, 5, 7, 1
9. For which of the following species d-d transition does not account for
its colour ?
(a)
(b)
(c)
(d) All
10. The “spin-only” magnetic moment [in units of Bohr magneton, (µ
B
)] of
Ni
2+
 in aqueous solution would be (At. No. Ni  = 28)
(a) 6
(b) 1.73
(c) 2.82
(d) 4.90
11. In which of the following lanthanides oxidation state +2 is most stable?
(a) Ce
(b) Eu
(c) Tb
(d) Dy
12. Which one of the following nitrates will leave behind a metal on strong
heating ?
(a) Copper nitrate
(b) Manganese nitrate
(c) Silver nitrate
(d) Ferric nitrate
13. The black compound formed during the reaction between
sodium thiosulphate and silver nitrate is
(a) silver thiosulphate 
(b) silver sulphide 
(c) silver sulphate 
(d) silver sulphite 
14. Which of the following arrangements does not represent the correct
order of the property stated against it ?
(a) V
2+
 < Cr
2+
 < Mn
2+
 < Fe
2+
 : paramagnetic behaviour
(b) Ni
2+
 < Co
2+
 < Fe
2+
 < Mn
2+
 : ionic size
(c) Co
3+
 < Fe
3+
 < Cr
3+
 < Sc
3+
 : stability in aqueous solution
(d) Sc < Ti < Cr < Mn : number of oxidation states
15. Which of the following factors may be regarded as the main cause of
lanthanoide contraction?
(a) Greater shielding of 5d electrons by 4f electrons.
(b) Poorer shielding of 5d electrons by 4f electrons.
(c) Effective shielding of one of 4f electrons by another in the subshell.
(d) Poor shielding of one of 4f electron by another in the subshell.
16. Which of the following elements shows maximum number of different
oxidation states in its compounds?
(a) Eu
(b) Ld
(c) Gd
(d) Am
17. An explosion take place when conc. H
2
SO
4
 is added to KMnO
4
. Which
of the following is formed?
(a) (b)
(c) (d)
18. AgCl is soluble in NH
4
OH solution. The solubility is due to the
formation of
(a) AgOH (b)
(c) (d)
19. Consider the complexes given below and choose the correct order of
paramagnetic moments (spin only)
I. [FeF
6
]
3– 
;
II. [CrF
6
]
3– 
;
III. [V(H
2
O)
6
]
3+ 
;
IV. [Ti(H
2
O)
6
]
3+
(a) I > II > III > IV
(b) I < II < III < IV
(c) I > III > IV > II
(d) III > I > IV > II
20. The value of the ‘spin only’ magnetic moment for one of the following
configurations is 2.82 BM. The correct one is
(a) d
5
 (in strong ligand field)
(b) d
3
 (in weak as well as in strong fields)
(c) d
4
 (in weak ligand fields)
(d) d
4
 (in strong ligand fields)
21. In neutral or faintly alkaline medium, thiosulphate is quantitatively