The P Block Elements CBSE Questions & Answers

The P Block Elements

This is Chemistry Class 11 The p Block Elements CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
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
    Si > C > Sn > Ge
  • C
    \({\text{C }} > > {\text{ Si }} > {\text{ Ge }} \approx {\text{ Sn}}\)
    Correct
  • D
    Ge > Sn > Si > C
2
Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding
  • A
    \({\text{M}}{{\text{e}}_{\text{4}}}{\text{Si}}\)
  • B
    \({\text{MeSiC}}{{\text{l}}_{\text{3}}}\)
  • C
    \({\text{M}}{{\text{e}}_{\text{3}}}{\text{SiCl}}\)
    Correct
  • D
    \({\text{M}}{{\text{e}}_{\text{2}}}{\text{Si C}}{{\text{l}}_{\text{2}}}\)
3
In the structure of diborane
  • A
    2 boron atoms and 4 terminal hydrogen atoms lie in the same plane and 2 bridging hydrogen atoms lie in the perpendicular plane.
    Correct
  • B
    All the atoms are in the same 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 hydrogen atoms lie in one plane and boron atoms lie in a plane perpendicular to this plane
4
Quartz is extensively used as a piezoelectric material, it contains ___________.
  • A
    Si
    Correct
  • B
    Pb
  • C
    Ti
  • D
    Sn
5
A compound X, of boron reacts with \({\text{N}}{{\text{H}}_{\text{3}}}\) on heating to give another compound. Y which is called inorganic benzene. The compound X can be prepared by treating \({\text{B}}{{\text{F}}_{\text{3}}}\) with Lithium aluminium hydride. The compounds X and Y are represented by the formulas.
  • A
    \({\text{B}}{{\text{F}}_{\text{3}}},{\text{ }}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
  • B
    \({{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}},{\text{ }}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
  • C
    \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}},{\text{ }}{{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}}\)
    Correct
  • D
    \({{\text{B}}_{\text{3}}}{{\text{N}}_{\text{3}}}{{\text{H}}_{\text{6}}},{\text{ }}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
6
The linear shape of \({\text{C}}{{\text{O}}_{\text{2}}}\) is due to _________.
  • A
    \({\text{ds}}{{\text{p}}^{\text{2}}}\) hybridisation of carbon
  • B
    \({\text{s}}{{\text{p}}^{\text{3}}}\) hybridisation of carbon
  • C
    \({\text{s}}{{\text{p}}^{\text{2}}}\) hybridisation of carbon
  • D
    p\(\pi\)– p\(\pi \) bonding between carbon and oxygen
    Correct
7
The reason for small radius of Ga compared to Al is _______.
  • A
    presence of higher orbitals
  • B
    decrease in nuclear charge
  • C
    poor screening effect of d and f orbitals
    Correct
  • D
    higher atomic number
8
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 and 14
  • C
    groups 2 and 13
  • D
    groups 2, 13 and 14
    Correct
9
Dry ice is
  • A
    Solid \({\text{S}}{{\text{O}}_{\text{2}}}\)
  • B
    Solid \({\text{C}}{{\text{O}}_{\text{2}}}\)
    Correct
  • C
    Solid \({\text{N}}{{\text{H}}_{\text{3}}}\)
  • D
    Solid \({{\text{N}}_{\text{2}}}\)
10
In trivalent state, for example, the trichlorides, being covalent are hydrolysed in water form
  • A
    trigonal structure
  • B
    tetrahedral structure
    Correct
  • C
    planar structure
  • D
    pentagonal structure
11
Diamond is covalent, yet it has high melting point. because of
  • A
    planar structure with strong C-C bonds difficult to break
  • B
    \({\text{s}}{{\text{p}}^{\text{2}}}\) hybridisation with strong C-C bonds difficult to break
  • C
    2-dimensional network with strong C-C bonds difficult to break
  • D
    3-dimensional network with strong C-C bonds difficult to break
    Correct
12
The valence shell electronic configuration of p-block elements is $n{s^2}n{p^{1 - 6}}$ But this is not true in the case of
  • A
    nitrogen
  • B
    carbon
  • C
    helium
    Correct
  • D
    Boron
13
Which is most easily liquefiable rare gas?
  • A
    Kr
  • B
    Ne
  • C
    Xe
    Correct
  • D
    Ar
14
\({\text{M}}{{\text{e}}_{\text{3}}}\) SiCl is used during polymerisation of organo silicones because
  • A
    the chain length of organo silicone polymers can be controlled by adding \({\text{M}}{{\text{e}}_{\text{3}}}\) SiCl
    Correct
  • B
    \({\text{M}}{{\text{e}}_{\text{3}}}\) SiCl improves the quality and yield of the polymer
  • C
    \({\text{M}}{{\text{e}}_{\text{3}}}\) SiCl acts as a catalyst during polymerisation
  • D
    \({\text{M}}{{\text{e}}_{\text{3}}}\) SiCl does not block the end terminal of silicone polymer
15
Which of the following statements are correct?
  • A
    Graphite is thermodynamically not stable allotrope of carbon
  • B
    Graphite is slippery and hard and therefore used as a dry lubricant in Machines
  • C
    Fullerenes have dangling bonds
  • D
    Fullerenes are cage-like molecules
    Correct