Objective Type Questions On Class 11 Chemistry Chapter 11 The P Block Elements

Questions
1 The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
A B
B Al
C Ga
D In

Answer:Ga
2 Which of the following is a Lewis acid ?
A AlCl3
B MgCl2
C CaCl2
D BaCl2

Answer:AlCl3
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
A sp3 , tetrahedral
B sp3 , square planar
C sp3d 2 , octahedral
D dsp2 , square planar

Answer:sp3 , tetrahedral
4 Which of the following oxides is acidic in nature?
A B2O3
B Al2O3
C Ga2O3
D In2O3

Answer:B2O3
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 P Block Element
A B
B Al
C Ga
D In

Answer:B
6 Boric acid is an acid because its molecule
A contains replaceable H+ ion
B gives up a proton
C accepts OH– from water releasing proton
D combines with proton from water molecule

Answer:accepts OH– from water releasing proton
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:
A C > Si > Ge > Sn
B C >> Si > Ge ≈ Sn
C Si > C > Sn > Ge
D Ge > Sn > Si > C

Answer:C >> Si > Ge ≈ Sn
8 Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
A MeSiCl3
B Me2SiCl2
C Me3SiCl
D Me4Si

Answer:Me3SiCl
9 onisation enthalpy (∆i H1 kJ mol–1) for the elements of Group 13 follows the order.
A B > Al > Ga > In > Tl
B B < Al < Ga < In < Tl
C B < Al > Ga < In > Tl
D B > Al < Ga > In < Tl

Answer:B > Al < Ga > In < Tl
10 In the structure of diborane
A All hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane.
B 2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.
C 4 bridging hydrogen atoms and boron atoms lie in one plane and two terminal hydrogen atoms lie in a plane perpendicular to this plane.
D All the atoms are in the same plane.

Answer:2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.
11 A compound X, of boron reacts with NH3 on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF3 with Lithium aluminium hydride. The compounds X and Y are represented by the formulas.
A B2H6 , B3N3H6
B B2O3, B3 N3 H6
C BF3, B3N3 H6
D B3N3H6 , B2H6

Answer:B2H6 , B3N3H6
12 Quartz is extensively used as a piezoelectric material, it contains ___________.
A Pb
B Si
C Ti
D Sn

Answer:Si
13 The most commonly used reducing agent is
A AlCl3
B PbCl2
C SnCl4
D SnCl2

Answer:SnCl2
14 Dry ice is
A Solid NH3
B Solid SO2
C Solid CO2
D Solid N2

Answer:Solid CO2
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?
A group 2
B groups 2, 13 and 14
C groups 2 and 13
D groups 2 and 14

Answer:groups 2, 13 and 14
16 The reason for small radius of Ga compared to Al is _______.
A poor screening effect of d and f orbitals
B increase in nuclear charge
C presence of higher orbitals
D higher atomic number

Answer:A, B
17 The linear shape of CO2 is due to _________.
A sp3 hybridisation of carbon
B sp hybridisation of carbon
C pπ – pπ bonding between carbon and oxygen
D sp2 hybridisation of carbon

Answer:B, C
18 Me3SiCl is used during polymerisation of organo silicones because
A the chain length of organo silicone polymers can be controlled by adding Me3SiCl
B Me3SiCl blocks the end terminal of silicone polymer
C Me3SiCl improves the quality and yield of the polymer
D Me3SiCl acts as a catalyst during polymerisation

Answer: A, B
19 Which of the following statements are correct?
A Fullerenes have dangling bonds
B Fullerenes are cage-like molecules
C Graphite is thermodynamically most stable allotrope of carbon
D Graphite is slippery and hard and therefore used as a dry lubricant in machines

Answer:B, C
20 Which of the following statements are correct. Answer on the basis of Fig

P Block Element

A The two birdged hydrogen atoms and the two boron atoms lie in one plane;
B Out of six B–H bonds two bonds can be described in terms of 3 centre 2-electron bonds.
C Out of six B-H bonds four B-H bonds can be described in terms of 3 centre 2 electron bonds;
D The four terminal B-H bonds are two centre-two electron regular bonds.

Answer:A, B, D

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