NCERT NEET Chemical bond objective questions,solutions ,mcqs,pdfs

Chemical Bond and Molecular Structure Mock Tests-3

Question No:1

Select the correct order of Increasing bond length of C =C,C -C.C- O and C H

[A] C-O < C-H < C-C < C-C
[B] C-C < C-C < C-O < C-H
[C] C-H < C-C,C-O < C-C
[D] C-H < C-O < C-C < C-C



Question No:2

Bond length is defined as the equilibrium distance between the nuclei of two bonded atoms in a molecule and it is measured by

[A] spectroscopic technique.
[B] X ray diffraction technique.
[C] electron diffraction technique.
[D] all of these.



Question No:3

Which of the following covalent bonds has maximum bond length?

[A] O – H
[B] C – H
[C] NO
[D] C – O



Question No:4

Which of the following will be the strongest bond?

[A] O H
[B] N – H
[C] O – Cl
[D] F – O



Question No:5

Which of the following statements is Incorrect?

[A] The covalent radius is measured approximately as the radius of an atom’s core which is In contact with the core of an adjacent atom in a bonded situation.
[B] The covalent radius is twice the distance between two similar atoms joined by a covalent bond in the same molecule.
[C] The vander Waals’ radius represents the overall size of the atom which includes its valence .shell in a non bonded situation.
[D] Bond length is the equilibrium distance between the nuclei of two bonded atoms in a molecule.



Question No:6

In which of the following options, first molecule average bond length is greater than the second one?

[A] C-N, C-C
[B] C-N,C-C
[C] C – C. C- N
[D] O – H, C – H



Question No:7

Some statements regarding bond angle are given below. Identify the correct statement(s).
(I) Bond angle is the angle between the orbitals containing bonding electron pairs around the central atom In a molecule/complex ion.
(II) Bond angle is expressed in degrees winch can lie experimentally determined by spectroscopic methods.
(III) Bond angle helps in determining the shape of the molecule/complex ion.
(IV) Bond angle gives some Idea regarding the distribution of orbitals around the central atom In a molecule/complex ion.

[A] III only
[B] I, II and IV
[C] I, II, III and IV
[D] I and III



Question No:8

What is the bond angle of H2O molecule?

[A] 104.5°
[B] 109.5°
[C] 120°
[D] 180°



Question No:9

Select the correct statement for bond enthalpy.

[A] It is the amount of energy required to break one mole of bonds of a particular type between two atoms in a gaseous state.
[B] It is the amount of energy required to break one mole of bonds of a particular type between two atoms in a liquid state.
[C] It is the amount of energy required to break one mole of bonds of a particular type between two atoms in a solid state.
[D] None of these



Question No:10

The normal OO and O-O bond length are 148 pm and 121 pm respectively. What are the experimental oxygen bond lengths In the O3 molecule?

[A] 128 pm
[B] 148pm
[C] 121 pm
[D] 110pm



Question No:11

How many canonical forms are possible for the carbonate (CO3<2-ion in terms of resonance?

[A] Two
[B] Three
[C] Four
[D] Five



Question No:12

In terms of resonance, how many canonical forma are possible for CO2 molecule?

[A] One
[B] Two
[C] Three
[D] Four



Question No:13

Some statements regarding resonance are given below. Identity the correct Statement(s).
(I) Resonance stabilises the molecule.
(II) The energy of the resonance hybrid is less than the energy of any single canonical structure.
(lll)Resonance averages the bond characteristics as a whole.

[A] I only
[B] II only
[C] II and lll
[D] I. II and lll



Question No:14

Two statements for polarity of bonds are given below:
(I) The existence of a 100% Ionic or covalent bond represents an ideal situation.
(II) In reality no bond or a compound is either completely covalent or ionic.
The given statements I and II are true or false?

[A] FF
[B] TT
[C] TF
[D] FT