Chemical Bonding And Molecular Structure CBSE Questions & Answers

Chemical Bonding And Molecular Structure

This is Chemistry Class 11 Chemical Bonding and Molecular Structure CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
For a stable molecule the value of bond order must be
  • A
    positive
    Correct
  • B
    negative
  • C
    there is no relationship between stability and bond order
  • D
    zero
2
In acetylene molecule, between the carbon atoms there are
  • A
    one sigma and two pi bonds
    Correct
  • B
    three sigma bonds
  • C
    three pi bonds
  • D
    two sigma and one pi bonds
3
In \({\text{PO}}_4^{3 - }\) ion the formal charge on the oxygen atom of P–O bond is
  • A
    – 0.75
  • B
    + 0.75
  • C
    – 1
    Correct
  • D
    + 1
4
Which molecule/ion out of the following does not contain unpaired electrons?
  • A
    \({{\text{B}}_2}\)
  • B
    \({\text{N}}_2^ + \)
  • C
    \({\text{O}}_2^{2 - }\)
    Correct
  • D
    \({{\text{O}}_2}\)
5
In which of the following substances will hydrogen bond be strongest?
  • A
    HCl
  • B
    \({{\text{H}}_{\text{2}}}{\text{S}}\)
  • C
    HI
  • D
    \({{\text{H}}_{\text{2}}}{\text{O}}\)
    Correct
6
When a gas phase atom in its ground state gains an electron. This is called
  • A
    Electron affinity
  • B
    ionization enthalpy
  • C
    electron gain enthalpy
    Correct
  • D
    lattice enthalpy
7
Which of the following angle corresponds to \({\text{s}}{{\text{p}}^{\text{2}}}\)hybridisation?
  • A
    \({\text{12}}0^\circ \)
  • B
    \({\text{9}}0^\circ \)
  • C
    \({\text{1}}0{\text{9}}^\circ \)
    Correct
  • D
    \({\text{18}}0^\circ \)
8
Which of the following statement is not correct from the view point of molecular orbital theory?
  • A
    Option A
    Correct
  • B
    Bond strength of \({{\text{N}}_{\text{2}}}\) is maximum amongst the homonuclear diatomic molecules belonging to the second period.
  • C
    \({\text{H}}{{\text{e}}_{\text{2}}}\) is not stable but \({\text{H}}{{\text{e}}^{{\text{2}} + }}\) is expected to exist.
  • D
    \({\text{B}}{{\text{e}}_{\text{2}}}\)is not a stable molecule
9
The electronic configuration of the outer most shell of the most electronegative element is
  • A
    \({\text{3}}{{\text{s}}^{\text{2}}}{\text{3}}{{\text{p}}^{\text{5}}}\)
  • B
    \({\text{4}}{{\text{s}}^{\text{2}}}{\text{4 }}{{\text{p}}^{\text{5}}}\)
  • C
    $2{s^2}2{p^5}$
    Correct
  • D
    \({\text{5}}{{\text{s}}^{\text{2}}}{{\text{5}}^{\text{5}}}\)
10
Using MO theory predicts which of the following species has the shortest bond length?
  • A
    ${\text{O}}_2^{2 + }$
    Correct
  • B
    \({\text{O}}_2^ - \)
  • C
    \({\text{O}}_2^{2 - }\)
  • D
    \({\text{O}}_2^ + \)
11
Which one of the following pairs of species has the same bond order?
  • A
    \({\text{C}}{{\text{N}}^ - }\) and \({\text{C}}{{\text{N}}^ + }\)
  • B
    \({\text{N}}{{\text{O}}^ + }\)and \({\text{C}}{{\text{N}}^ + }\)
  • C
    \({{\text{O}}_{\text{2}}}^ - \)and \({\text{C}}{{\text{N}}^ - }\)
  • D
    \({\text{C}}{{\text{N}}^ - }\) and \({\text{N}}{{\text{O}}^ + }\)
    Correct
12
Which of the following attain the linear structure?
  • A
    \({\text{BeC}}{{\text{l}}_{\text{2}}}\)and \({\text{C}}{{\text{S}}_{\text{2}}}\)
    Correct
  • B
    \({\text{C}}{{\text{S}}_{\text{2}}}\)and \({\text{NC}}{{\text{O}}^ + }\)
  • C
    \({\text{BeC}}{{\text{l}}_{\text{2}}}\)and \({\text{N}}{{\text{O}}_{\text{2}}}\)
  • D
    \({\text{BeC}}{{\text{l}}_{\text{2}}}\)and \({\text{NC}}{{\text{O}}^ + }\)
13
CO is isoelectronic with
  • A
    \({{\text{N}}_{\text{2}}}\)and \({\text{SnC}}{{\text{l}}_{\text{2}}}\)
  • B
    \({\text{N}}{{\text{O}}^ + }\)and \({{\text{N}}_{\text{2}}}\)
    Correct
  • C
    \(NO_2^ - \) and \({\text{SnC}}{{\text{l}}_{\text{2}}}\)
  • D
    \({\text{SnC}}{{\text{l}}_{\text{2}}}\)and \({\text{N}}{{\text{O}}^ + }\)
14
Which of the following species have the same shape?
  • A
    \({{\text{O}}_{\text{3}}}\) and \({\text{C}}{{\text{O}}_{\text{2}}}\)
  • B
    \({\text{CC}}{{\text{l}}_{\text{4}}}\) and \(NO_2^ - \)
  • C
    \({{\text{O}}_{\text{3}}}\)and N\({\text{O}}_2^ - \)
    Correct
  • D
    \(NO_2^ - \) and \({\text{CC}}{{\text{l}}_{\text{4}}}\)
15
Hydrogen bonds are formed in many compounds e.g., \({{\text{H}}_{\text{2}}}{\text{O}}\), HF, \({\text{N}}{{\text{H}}_{\text{3}}}\).The boiling point of such compounds depends to a large extent on the strength of hydrogen bond and the number of hydrogen bonds. The correct decreasing order of the boiling points of above compounds is :
  • A
    \({{\text{H}}_{\text{2}}}{\text{O }} > {\text{ HF }} > {\text{ N}}{{\text{H}}_{\text{3}}}\)
    Correct
  • B
    \({\text{HF }} > {\text{ }}{{\text{H}}_{\text{2}}}{\text{O }} > {\text{ N}}{{\text{H}}_{\text{3}}}\)
  • C
    \({\text{N}}{{\text{H}}_{\text{3}}} > {\text{ HF }} > {\text{ }}{{\text{H}}_{\text{2}}}{\text{O}}\)
  • D
    \({\text{N}}{{\text{H}}_{\text{3}}} > {\text{ }}{{\text{H}}_{\text{2}}}{\text{O }} > {\text{ HF}}\)