Classification Of Elements And Periodicity CBSE Questions & Answers

Classification Of Elements And Periodicity

This is Chemistry Class 11 Classification of Elements and Periodicity CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The outer electronic configuration of f - Block elements are:
  • A
    \({\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}{\text{4}}{{\text{s}}^{\text{2}}}\)
  • B
    \({\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{6}}}\)
  • C
    \({\text{6}}{{\text{s}}^{\text{2}}}{\text{4}}{{\text{f}}^{\text{3}}}\)
    Correct
  • D
    \({\text{3}}{{\text{d}}^{{\text{1}}0}}{\text{4}}{{\text{s}}^{\text{2}}}\)
2
The correct order for the increase in atomic radii is
  • A
    F< C< I< Br
  • B
    C< Br< I<F
  • C
    I< Br< Br< F
  • D
    F< C < Br < I
    Correct
3
The correct order for the decrease in atomic radii is
  • A
    Be< B< C< Li
  • B
    Li< Be< B< C
    Correct
  • C
    Li< Be< B< C
  • D
    C< Li< Be< B
4
One of the following has ns1 and ns2 as its outermost electronic configuration
  • A
    Alkali metals
    Correct
  • B
    Transition elements)
  • C
    Alkaline earth metals
  • D
    Lanthanoids
5
The order of increasing metallic character is:
  • A
    Si < Mg < Na < P < Be
  • B
    Si < Be < Mg < Na < P
  • C
    P < Si < Be < Mg < Na.
    Correct
  • D
    Be < Mg < Na < P< Si
6
The elements charecterised by the filling of 4 f-orbitals, are:
  • A
    Alkaline earth metals
  • B
    Transition elements)
  • C
    Lanthanoids
    Correct
  • D
    Alkali metals
7
One of the following options is not used for explaining atomic radius
  • A
    metallic radius
  • B
    van der waals’radius
  • C
    covalent radius
  • D
    coordinate radius
    Correct
8
The order of increasing radius is
  • A
    Metallic radius > Van der Waals’radius > Covalent radius
  • B
    Van der Waals’radius > Covalent radius > Metallic radius
  • C
    Covalent radius <Metallic radius > Van der Waals’radius
  • D
    Van der Waals’radius > Metallic radius > Covalent radius
    Correct
9
Choose one of the following in th increasing order of bond length
  • A
    Cl2 < O2 < N2 < F2
  • B
    F2 < Cl2 < O2 < N2
  • C
    F2, N2, Cl2, O2
  • D
    N2 < O2 < F2 < Cl2
    Correct
10
Choose one of the following in the increasing order of electron gain enthalpy
  • A
    F < Cl < Br < I
  • B
    Br < F < Cl < I
  • C
    I < Br < F < Cl
    Correct
  • D
    Cl < I < Br < F
11
Choose one of the following in the increasing order of increasing ionic radii
  • A
    \({\text{N}}{{\text{a}}^ + } < {\text{ F}}--{\text{ }} < {\text{ }}{{\text{O}}^{{\text{2}}\_}} < {\text{ }}{{\text{N}}^{{\text{3}}\_}} < {\text{ A}}{{\text{l}}^{{\text{3}} + }} < {\text{ M}}{{\text{g}}^{{\text{2}} + }}\)
  • B
    \({\text{M}}{{\text{g}}^{{\text{2}} + }} < {\text{ N}}{{\text{a}}^ + } < {\text{ F}}--{\text{ }} < {\text{ }}{{\text{O}}^{{\text{2}}\_}} < {\text{ }}{{\text{N}}^{{\text{3}}\_}} < {\text{ A}}{{\text{l}}^{{\text{3}} + }}\)
  • C
    \({{\text{N}}^{{\text{3}}\_}} < {\text{ }}{{\text{O}}^{{\text{2}}\_}} < {\text{ F}}--{\text{ }} < {\text{ N}}{{\text{a}}^ + } < {\text{ M}}{{\text{g}}^{{\text{2}} + }} < {\text{ A}}{{\text{l}}^{{\text{3}} + }}\)
  • D
    \({\text{A}}{{\text{l}}^{{\text{3}} + }} < {\text{ M}}{{\text{g}}^{{\text{2}} + }} < {\text{ N}}{{\text{a}}^ + } < {\text{ F}}--{\text{ }} < {\text{ }}{{\text{O}}^{{\text{2}}\_}} < {\text{ }}{{\text{N}}^{{\text{3}}\_}}\)
    Correct
12
\({Al^{(3 + )}} < {Mg^{(2 + )}} < Na + < {F^ - } < {O^{(2 - )}} < {N^{(3 - )}}\) The above can be aptly described as
  • A
    isoelectronic species
    Correct
  • B
    the same number of electrons (7 electrons).
  • C
    the same number of electrons (9 electrons).
  • D
    the same number of electrons (8 electrons).
13
Choose one of one of the following in the order of increasing radii:
  • A
    \({{\text{I}}^\_} < {\text{ }}{{\text{I}}^ + } < {\text{ I}}\)
  • B
    \({{\text{I}}^\_} < {\text{ I }} < {\text{ }}{{\text{I}}^ + }\)
    Correct
  • C
    \({\text{I }} < {\text{ }}{{\text{I}}^ + } < {\text{ }}{{\text{I}}^\_}\)
  • D
    \({{\text{I}}^ + } < {\text{ }}{{\text{I}}^\_} < {\text{ I}}\)
14
Arrange the following in th increasing order of bond dissociation energy
  • A
    \({{\text{F}}_{\text{2}}} < {\text{ }}{{\text{N}}_{\text{2}}} < {\text{ C}}{{\text{l}}_{\text{2}}} < {\text{ }}{{\text{O}}_{\text{2}}}\)
  • B
    \({{\text{N}}_{\text{2}}} < {\text{ }}{{\text{O}}_{\text{2}}} < {\text{ }}{{\text{F}}_{\text{2}}} < {\text{ C}}{{\text{l}}_{\text{2}}}\)
  • C
    \({{\text{F}}_{\text{2}}} < {\text{ C}}{{\text{l}}_{\text{2}}} < {\text{ }}{{\text{O}}_{\text{2}}} < {\text{ }}{{\text{N}}_{\text{2}}}\)
    Correct
  • D
    \({\text{C}}{{\text{l}}_{\text{2}}} < {\text{ }}{{\text{O}}_{\text{2}}} < {\text{ }}{{\text{N}}_{\text{2}}} < {\text{ }}{{\text{F}}_{\text{2}}}\)
15
The typical range of molar enthalpies for the strongest intermolecular (Hydrogen) bonds is
  • A
    4 – 25 J
  • B
    4 – 25 kJ
    Correct
  • C
    300 – 500 kJ
  • D
    200 – 300 kJ