P-Block NCERT EXEMPLAR JEE Notes | EduRev

Created by: Vivek Saxena

JEE : P-Block NCERT EXEMPLAR JEE Notes | EduRev

 Page 1


1. The element which exists in liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
2. Which of the following is a Lewis acid ?
(i) AlCl
3
(ii) MgCl
2
(iii) CaCl
2
(iv) BaCl
2
3. The geometry of a complex species can be understood from the knowledge of
type of hybridisation of orbitals of central atom. The hybridisation of orbitals
of central atom in [Be(OH)
4
]
–
 and the geometry of the complex  are respectively
(i) sp
3 
, tetrahedral
(ii) sp
3
 , square planar
(iii) sp
3
d
2
 , octahedral
(iv) dsp
2
 , square planar
4. Which of the following oxides is acidic in nature?
(i) B
2
O
3
(ii) Al
2
O
3
(iii) Ga
2
O
3
(iv) In
2
O
3
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
11 11
THE THE THE THE THE p p p p p -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS THE THE THE THE THE p p p p p     -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS
Page 2


1. The element which exists in liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
2. Which of the following is a Lewis acid ?
(i) AlCl
3
(ii) MgCl
2
(iii) CaCl
2
(iv) BaCl
2
3. The geometry of a complex species can be understood from the knowledge of
type of hybridisation of orbitals of central atom. The hybridisation of orbitals
of central atom in [Be(OH)
4
]
–
 and the geometry of the complex  are respectively
(i) sp
3 
, tetrahedral
(ii) sp
3
 , square planar
(iii) sp
3
d
2
 , octahedral
(iv) dsp
2
 , square planar
4. Which of the following oxides is acidic in nature?
(i) B
2
O
3
(ii) Al
2
O
3
(iii) Ga
2
O
3
(iv) In
2
O
3
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
11 11
THE THE THE THE THE p p p p p -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS THE THE THE THE THE p p p p p     -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS
5. The exhibition of highest co-ordination number depends on the availability of
vacant orbitals in the central atom. Which of the following elements is not likely
to act as central atom in MF
6
3–
 
?
(i) B
(ii) Al
(iii) Ga
(iv) In
6. Boric acid is an acid because its molecule
(i) contains replaceable H
+
 ion
(ii) gives up a proton
(iii) accepts OH
–
 from water releasing proton
(iv) combines with proton from water molecule
7. Catenation i.e., linking of similar atoms depends on size and electronic
configuration of atoms. The tendency of catenation in Group 14 elements
follows the order:
(i) C > Si > Ge > Sn
(ii) C >> Si > Ge ˜ Sn
(iii) Si > C > Sn > Ge
(iv) Ge > Sn > Si > C
8. Silicon has a strong tendency to form polymers like silicones. The chain length
of silicone polymer can be controlled by adding
(i) MeSiCl
3
(ii) Me
2
SiCl
2
(iii) Me
3
SiCl
(iv) Me
4
Si
9. Ionisation enthalpy ( ?
i 
H
1
 kJ mol
–1
) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl
(ii) B < Al < Ga < In < Tl
(iii) B < Al > Ga < In > Tl
(iv) B > Al < Ga > In < Tl
10. In the structure of diborane
(i) All hydrogen atoms lie in one plane and boron atoms lie in a plane
perpendicular to this plane.
(ii) 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane
and 2 bridging hydrogen atoms lie in the perpendicular plane.
(iii) 4 bridging hydrogen atoms and boron atoms lie in one plane and two
terminal hydrogen atoms lie in a plane perpendicular to this plane.
(iv) All the atoms are in the same plane.
135 The p-Block Elements
Page 3


1. The element which exists in liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
2. Which of the following is a Lewis acid ?
(i) AlCl
3
(ii) MgCl
2
(iii) CaCl
2
(iv) BaCl
2
3. The geometry of a complex species can be understood from the knowledge of
type of hybridisation of orbitals of central atom. The hybridisation of orbitals
of central atom in [Be(OH)
4
]
–
 and the geometry of the complex  are respectively
(i) sp
3 
, tetrahedral
(ii) sp
3
 , square planar
(iii) sp
3
d
2
 , octahedral
(iv) dsp
2
 , square planar
4. Which of the following oxides is acidic in nature?
(i) B
2
O
3
(ii) Al
2
O
3
(iii) Ga
2
O
3
(iv) In
2
O
3
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
11 11
THE THE THE THE THE p p p p p -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS THE THE THE THE THE p p p p p     -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS
5. The exhibition of highest co-ordination number depends on the availability of
vacant orbitals in the central atom. Which of the following elements is not likely
to act as central atom in MF
6
3–
 
?
(i) B
(ii) Al
(iii) Ga
(iv) In
6. Boric acid is an acid because its molecule
(i) contains replaceable H
+
 ion
(ii) gives up a proton
(iii) accepts OH
–
 from water releasing proton
(iv) combines with proton from water molecule
7. Catenation i.e., linking of similar atoms depends on size and electronic
configuration of atoms. The tendency of catenation in Group 14 elements
follows the order:
(i) C > Si > Ge > Sn
(ii) C >> Si > Ge ˜ Sn
(iii) Si > C > Sn > Ge
(iv) Ge > Sn > Si > C
8. Silicon has a strong tendency to form polymers like silicones. The chain length
of silicone polymer can be controlled by adding
(i) MeSiCl
3
(ii) Me
2
SiCl
2
(iii) Me
3
SiCl
(iv) Me
4
Si
9. Ionisation enthalpy ( ?
i 
H
1
 kJ mol
–1
) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl
(ii) B < Al < Ga < In < Tl
(iii) B < Al > Ga < In > Tl
(iv) B > Al < Ga > In < Tl
10. In the structure of diborane
(i) All hydrogen atoms lie in one plane and boron atoms lie in a plane
perpendicular to this plane.
(ii) 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane
and 2 bridging hydrogen atoms lie in the perpendicular plane.
(iii) 4 bridging hydrogen atoms and boron atoms lie in one plane and two
terminal hydrogen atoms lie in a plane perpendicular to this plane.
(iv) All the atoms are in the same plane.
135 The p-Block Elements 136 Exemplar Problems, Chemistry
11. A compound X, of boron reacts with NH
3
 on heating to give another compound
Y which is called inorganic benzene. The compound X can be prepared by
treating BF
3
 with Lithium aluminium hydride. The compounds X and Y are
represented by the formulas.
(i) B
2
H
6 
, B
3
N
3
H
6
(ii) B
2
O
3
, B
3
 N
3
 H
6
(iii) BF
3
, B
3
N
3
 H
6
(iv) B
3
N
3
H
6 
, B
2
H
6
12. Quartz is extensively used as a piezoelectric material, it contains ___________.
(i) Pb
(ii) Si
(iii) Ti
(iv) Sn
13. The most commonly used reducing agent is
(i) AlCl
3
(ii) PbCl
2
(iii) SnCl
4
(iv) SnCl
2
14. Dry ice is
(i) Solid NH
3
(ii) Solid SO
2
(iii) Solid CO
2
(iv) Solid N
2
15. Cement, the important building material is a mixture of oxides of several
elements. Besides calcium, iron and sulphur, oxides of elements of which of
the group (s) are present in the mixture?
(i) group 2
(ii) groups 2, 13 and 14
(iii) groups 2 and 13
(iv) groups 2 and 14
II. Multiple Choice Questions (Type-II)
In the following questions two or more options may be correct.
16. The reason for small radius of Ga compared to Al is _______.
(i) poor screening effect of d and f orbitals
(ii) increase in nuclear charge
Page 4


1. The element which exists in liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
2. Which of the following is a Lewis acid ?
(i) AlCl
3
(ii) MgCl
2
(iii) CaCl
2
(iv) BaCl
2
3. The geometry of a complex species can be understood from the knowledge of
type of hybridisation of orbitals of central atom. The hybridisation of orbitals
of central atom in [Be(OH)
4
]
–
 and the geometry of the complex  are respectively
(i) sp
3 
, tetrahedral
(ii) sp
3
 , square planar
(iii) sp
3
d
2
 , octahedral
(iv) dsp
2
 , square planar
4. Which of the following oxides is acidic in nature?
(i) B
2
O
3
(ii) Al
2
O
3
(iii) Ga
2
O
3
(iv) In
2
O
3
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
11 11
THE THE THE THE THE p p p p p -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS THE THE THE THE THE p p p p p     -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS
5. The exhibition of highest co-ordination number depends on the availability of
vacant orbitals in the central atom. Which of the following elements is not likely
to act as central atom in MF
6
3–
 
?
(i) B
(ii) Al
(iii) Ga
(iv) In
6. Boric acid is an acid because its molecule
(i) contains replaceable H
+
 ion
(ii) gives up a proton
(iii) accepts OH
–
 from water releasing proton
(iv) combines with proton from water molecule
7. Catenation i.e., linking of similar atoms depends on size and electronic
configuration of atoms. The tendency of catenation in Group 14 elements
follows the order:
(i) C > Si > Ge > Sn
(ii) C >> Si > Ge ˜ Sn
(iii) Si > C > Sn > Ge
(iv) Ge > Sn > Si > C
8. Silicon has a strong tendency to form polymers like silicones. The chain length
of silicone polymer can be controlled by adding
(i) MeSiCl
3
(ii) Me
2
SiCl
2
(iii) Me
3
SiCl
(iv) Me
4
Si
9. Ionisation enthalpy ( ?
i 
H
1
 kJ mol
–1
) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl
(ii) B < Al < Ga < In < Tl
(iii) B < Al > Ga < In > Tl
(iv) B > Al < Ga > In < Tl
10. In the structure of diborane
(i) All hydrogen atoms lie in one plane and boron atoms lie in a plane
perpendicular to this plane.
(ii) 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane
and 2 bridging hydrogen atoms lie in the perpendicular plane.
(iii) 4 bridging hydrogen atoms and boron atoms lie in one plane and two
terminal hydrogen atoms lie in a plane perpendicular to this plane.
(iv) All the atoms are in the same plane.
135 The p-Block Elements 136 Exemplar Problems, Chemistry
11. A compound X, of boron reacts with NH
3
 on heating to give another compound
Y which is called inorganic benzene. The compound X can be prepared by
treating BF
3
 with Lithium aluminium hydride. The compounds X and Y are
represented by the formulas.
(i) B
2
H
6 
, B
3
N
3
H
6
(ii) B
2
O
3
, B
3
 N
3
 H
6
(iii) BF
3
, B
3
N
3
 H
6
(iv) B
3
N
3
H
6 
, B
2
H
6
12. Quartz is extensively used as a piezoelectric material, it contains ___________.
(i) Pb
(ii) Si
(iii) Ti
(iv) Sn
13. The most commonly used reducing agent is
(i) AlCl
3
(ii) PbCl
2
(iii) SnCl
4
(iv) SnCl
2
14. Dry ice is
(i) Solid NH
3
(ii) Solid SO
2
(iii) Solid CO
2
(iv) Solid N
2
15. Cement, the important building material is a mixture of oxides of several
elements. Besides calcium, iron and sulphur, oxides of elements of which of
the group (s) are present in the mixture?
(i) group 2
(ii) groups 2, 13 and 14
(iii) groups 2 and 13
(iv) groups 2 and 14
II. Multiple Choice Questions (Type-II)
In the following questions two or more options may be correct.
16. The reason for small radius of Ga compared to Al is _______.
(i) poor screening effect of d and f orbitals
(ii) increase in nuclear charge
137 The p-Block Elements
(iii) presence of higher orbitals
(iv) higher atomic number
17. The linear shape of CO
2
 is due to _________.
(i) sp
3
 hybridisation of carbon
(ii) sp hybridisation of carbon
(iii) pp
 
– pp
 
bonding between carbon and oxygen
(iv) sp
2 
hybridisation of carbon
18. Me
3
SiCl is used during polymerisation of organo silicones because
(i) the chain length of organo silicone polymers can be controlled by adding
Me
3
SiCl
(ii) Me
3
SiCl blocks the end terminal of silicone polymer
(iii) Me
3
SiCl improves the quality and yield of the polymer
(iv) Me
3
SiCl acts as a catalyst during polymerisation
19. Which of the following statements are correct?
(i) Fullerenes have dangling bonds
(ii) Fullerenes are cage-like molecules
(iii) Graphite is thermodynamically most stable allotrope of carbon
(iv) Graphite is slippery and hard and therefore used as a dry lubricant in
machines
20. Which of the following statements are correct. Answer on the basis of Fig.11.1.
(i) The two birdged hydrogen
atoms and the two boron atoms
lie in one plane;
(ii) Out of six B–H bonds two
bonds can be described in
terms of 3 centre 2-electron
bonds.
(iii) Out of six B-H bonds four B-H
bonds can be described in
terms of 3 centre 2 electron
bonds;
(iv) The four terminal B-H bonds
are two centre-two electron regular bonds.
21. Identify the correct resonance structures of carbon dioxide from the ones given
below :
(i) O – C = O
(ii) O = C = O
(iii)
–
O = C – O
+
(iv)
–
O – C = O
+
Fig. 11.1
Page 5


1. The element which exists in liquid state for a wide range of temperature and
can be used for measuring high temperature is
(i) B
(ii) Al
(iii) Ga
(iv) In
2. Which of the following is a Lewis acid ?
(i) AlCl
3
(ii) MgCl
2
(iii) CaCl
2
(iv) BaCl
2
3. The geometry of a complex species can be understood from the knowledge of
type of hybridisation of orbitals of central atom. The hybridisation of orbitals
of central atom in [Be(OH)
4
]
–
 and the geometry of the complex  are respectively
(i) sp
3 
, tetrahedral
(ii) sp
3
 , square planar
(iii) sp
3
d
2
 , octahedral
(iv) dsp
2
 , square planar
4. Which of the following oxides is acidic in nature?
(i) B
2
O
3
(ii) Al
2
O
3
(iii) Ga
2
O
3
(iv) In
2
O
3
I. Multiple Choice Questions (Type-I)
Unit Unit Unit Unit Unit
11 11
THE THE THE THE THE p p p p p -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS THE THE THE THE THE p p p p p     -BL -BL -BL -BL -BLOCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS OCK ELEMENTS
5. The exhibition of highest co-ordination number depends on the availability of
vacant orbitals in the central atom. Which of the following elements is not likely
to act as central atom in MF
6
3–
 
?
(i) B
(ii) Al
(iii) Ga
(iv) In
6. Boric acid is an acid because its molecule
(i) contains replaceable H
+
 ion
(ii) gives up a proton
(iii) accepts OH
–
 from water releasing proton
(iv) combines with proton from water molecule
7. Catenation i.e., linking of similar atoms depends on size and electronic
configuration of atoms. The tendency of catenation in Group 14 elements
follows the order:
(i) C > Si > Ge > Sn
(ii) C >> Si > Ge ˜ Sn
(iii) Si > C > Sn > Ge
(iv) Ge > Sn > Si > C
8. Silicon has a strong tendency to form polymers like silicones. The chain length
of silicone polymer can be controlled by adding
(i) MeSiCl
3
(ii) Me
2
SiCl
2
(iii) Me
3
SiCl
(iv) Me
4
Si
9. Ionisation enthalpy ( ?
i 
H
1
 kJ mol
–1
) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl
(ii) B < Al < Ga < In < Tl
(iii) B < Al > Ga < In > Tl
(iv) B > Al < Ga > In < Tl
10. In the structure of diborane
(i) All hydrogen atoms lie in one plane and boron atoms lie in a plane
perpendicular to this plane.
(ii) 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane
and 2 bridging hydrogen atoms lie in the perpendicular plane.
(iii) 4 bridging hydrogen atoms and boron atoms lie in one plane and two
terminal hydrogen atoms lie in a plane perpendicular to this plane.
(iv) All the atoms are in the same plane.
135 The p-Block Elements 136 Exemplar Problems, Chemistry
11. A compound X, of boron reacts with NH
3
 on heating to give another compound
Y which is called inorganic benzene. The compound X can be prepared by
treating BF
3
 with Lithium aluminium hydride. The compounds X and Y are
represented by the formulas.
(i) B
2
H
6 
, B
3
N
3
H
6
(ii) B
2
O
3
, B
3
 N
3
 H
6
(iii) BF
3
, B
3
N
3
 H
6
(iv) B
3
N
3
H
6 
, B
2
H
6
12. Quartz is extensively used as a piezoelectric material, it contains ___________.
(i) Pb
(ii) Si
(iii) Ti
(iv) Sn
13. The most commonly used reducing agent is
(i) AlCl
3
(ii) PbCl
2
(iii) SnCl
4
(iv) SnCl
2
14. Dry ice is
(i) Solid NH
3
(ii) Solid SO
2
(iii) Solid CO
2
(iv) Solid N
2
15. Cement, the important building material is a mixture of oxides of several
elements. Besides calcium, iron and sulphur, oxides of elements of which of
the group (s) are present in the mixture?
(i) group 2
(ii) groups 2, 13 and 14
(iii) groups 2 and 13
(iv) groups 2 and 14
II. Multiple Choice Questions (Type-II)
In the following questions two or more options may be correct.
16. The reason for small radius of Ga compared to Al is _______.
(i) poor screening effect of d and f orbitals
(ii) increase in nuclear charge
137 The p-Block Elements
(iii) presence of higher orbitals
(iv) higher atomic number
17. The linear shape of CO
2
 is due to _________.
(i) sp
3
 hybridisation of carbon
(ii) sp hybridisation of carbon
(iii) pp
 
– pp
 
bonding between carbon and oxygen
(iv) sp
2 
hybridisation of carbon
18. Me
3
SiCl is used during polymerisation of organo silicones because
(i) the chain length of organo silicone polymers can be controlled by adding
Me
3
SiCl
(ii) Me
3
SiCl blocks the end terminal of silicone polymer
(iii) Me
3
SiCl improves the quality and yield of the polymer
(iv) Me
3
SiCl acts as a catalyst during polymerisation
19. Which of the following statements are correct?
(i) Fullerenes have dangling bonds
(ii) Fullerenes are cage-like molecules
(iii) Graphite is thermodynamically most stable allotrope of carbon
(iv) Graphite is slippery and hard and therefore used as a dry lubricant in
machines
20. Which of the following statements are correct. Answer on the basis of Fig.11.1.
(i) The two birdged hydrogen
atoms and the two boron atoms
lie in one plane;
(ii) Out of six B–H bonds two
bonds can be described in
terms of 3 centre 2-electron
bonds.
(iii) Out of six B-H bonds four B-H
bonds can be described in
terms of 3 centre 2 electron
bonds;
(iv) The four terminal B-H bonds
are two centre-two electron regular bonds.
21. Identify the correct resonance structures of carbon dioxide from the ones given
below :
(i) O – C = O
(ii) O = C = O
(iii)
–
O = C – O
+
(iv)
–
O – C = O
+
Fig. 11.1
138 Exemplar Problems, Chemistry
III. Short Answer Type
22. Draw the structures of BCl
3
.NH
3
 and AlCl
3
 (dimer).
23. Explain the nature of boric acid as a Lewis acid in water.
24. Draw the structure of boric acid showing hydrogen bonding. Which species
is present in water? What is the hybridisation of boron in this species?
25. Explain why the following compounds behave as Lewis acids?
(i) BCl
3
(ii) AlCl
3
26. Give reasons for the following:
(i) CCl
4
 is immiscible in water, whereas SiCl
4
 is easily hydrolysed.
(ii) Carbon has a strong tendency for catenation compared to silicon.
27. Explain the following :
(i) CO
2
 is a gas whereas SiO
2
 is a solid.
(ii) Silicon forms SiF
6
2–
 ion whereas corresponding fluoro compound of
carbon is not known.
28. The +1 oxidation state in group 13 and +2 oxidation state in group 14 becomes
more and more stable with increasing atomic number. Explain.
29. Carbon and silicon both belong to the group 14, but inspite of the
stoichiometric similarity, the dioxides, (i.e., carbon dioxide and silicon dioxide),
differ in their structures. Comment.
30. If a trivalent atom replaces a few silicon atoms in three dimensional network
of silicon dioxide, what would be the type of charge on overall structure?
31. When BCl
3
 is treated with water , it hydrolyses and forms [B[OH]
4
]
–
 only whereas
AlCl
3
 in acidified aqueous solution forms [Al (H
2
O)
6
]
3+
 ion. Explain what is the
hybridisation of boron and aluminium in these species?
32. Aluminium dissolves in mineral acids and aqueous alkalies and thus shows
amphoteric character. A piece of aluminium foil is treated with dilute
hydrochloric acid or dilute sodium hydroxide solution in a test tube and on
bringing a burning matchstick near the mouth of the test tube, a pop sound
indicates the evolution of hydrogen gas. The same activity when performed
with concentrated nitric acid, reaction doesn’t proceed. Explain the reason.
33. Explain the following :
(i) Gallium has higher ionisation enthalpy than aluminium.
(ii) Boron does not exist  as B
3+
 ion.
(iii) Aluminium forms [AlF
6
]
3–
 ion but boron does not form [BF
6
]
3–
 ion.
(iv) PbX
2
 is more stable than PbX
4
.
(v) Pb
4+
 acts as an oxidising agent but Sn
2+
 acts as a reducing agent.
(vi) Electron gain enthalpy of chlorine is more negative as compared to fluorine.
(vii) Tl (NO
3
)
3
 acts as an oxidising agent.
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