chemical bonding

Class 11 Chemistry Chemical Bonding mcqs ( Part 3)

Class 11 Chemistry Chemical Bonding mcqs

Must Watch Chemical Bonding Multiple choose questions

A molecule with the smallest angle b/w two adjacent bonds, is:

1.CO2

2.CH4

3.NH3

4.H2O

Answer ) H2O

Brief Explanation :

H2O molecule with the smallest angle b/w two adjacent bonds due to the compression of two bond pairs by the two  lone pairs of electrons on the oxygen atom.


A molecular orbital with higher energy than the atomic orbitals ,is:

1.BMO

2.ABMO

3.Hybrid orbitals

4.Un-Hybrid orbitals

Answer ) ABMO

Brief Explanation :

  An anti bonding MO  has always higher energy than the atomic orbitals .


Hybridization of carbon in  CH3-O-CH3 is :

1.sp3

2.sp2

3.sp

4.dsp2

Answer ) sp3

Brief Explanation :

Carbon in CH3-O-CH3 (Dimethyl ether ) is sp3 hybridized and has a bent shape.


Carboxylic acid in acetic acid [ CH3COOH ] is hybridized:

1.sp

2.sp2

3.sp3

4.dsp2

Answer ) sp2

Brief Explanation :

Carboxylic acid in acetic acid [ CH3-CO-OH ] is attached with three other atoms and thus sp2 hybridized.


Dipole moment can not be used to predict / identify :

1.% ionic character

2.Geometry of molecules

3.Cis – trans isomers

4.Limiting reactant

Answer ) Limiting reactant

Brief Explanation :

Dipole moment can be used to predict % ionic character , geometry of molecules and also identify cis – trans isomers.


Bond order gives information about:

1.Bond energy

2.Bond length

3.Stability of molecule/ion

4.All of these

Answer )   All of these

Brief Explanation :

Bond order is half of the difference between number of electrons in the bonding and antibonding molecular orbitals.

It gives information about bond energy , bond length and stability of molecule / ion.

Higher the bond order , greater is the stability and bond energy while shorter is the bond length.


A tetra atomic molecule with zero dipole moment is:

1.Bent

2.Pyramidal

3.Unsymmetrical

4.Planar Trigonal

Answer ) Planar Trigonal

Brief Explanation :

 Tetra atomic molecule like BF3 , BH3 etc with zero dipole moment have planar Trigonal shapes.

The different bond moments cancel out each other effect and the resultant dipole moment is zero.


Oxygen is paramagnetic due to the presence of:

1.Unpaired electrons in AOs

2.Unpaired electrons in BMOs

3.Unpaired electrons in ABMOs

4.Paired electrons in ABMOs

Answer )Unpaired electrons in ABMOs

Brief Explanation :

Oxygen is paramagnetic due to the presence of two unpaired Electrons in ABMOs.

An unpaired electron produces a magnetic field due to spinning around its own axis & act as a small magnet.


Bond energy does not depend upon:

1.Polarity of bond

2.Multiplicity of bond

3.Size of bonded atoms

4.None of these

Answer ) None of these

Brief Explanation :

Bond energy increases with the increase in polarity & multiplicity of bond while decreases with the increase in the size of bonded atoms.


Bond dissociation energy of a covalent bond decreases with increase in:

1.Polarity

2.Multiplicity of bond

3.Size of atoms

4.None of these

Answer ) Size of bonded atoms

Brief Explanation :

Bond dissociation energy of a covalent bond decreases with increase in size of bonded atoms.


When s-character of a hybrid orbital increases , bond length :

1.Remains constant

2.Increases

3.Decreases

4.Not well defined

Answer ) Decreases

Brief Explanation :

When s-character of a hybrid orbital increases , bond length decreases .

For example , C-C bond length in ethane (sp3) , ethylene (sp2) and acetylene ( sp) are 1.54 Ao  , 1.34 Ao  & 1.20 Ao  .


Dipole moment is generally expressed in units of Debye (D):

1.1 D = 1.6 X 10 23 C.m

2.1 D = 3.34 X 10 -19 C.m

3.1 D = 3.34 X 10 -30 C.m

4.1 D = 6.62 X 10 -34 C.m

Answer ) 1 D = 3.34 X 10 -30 C.m

Brief Explanation :

Dipole moment is generally expressed in units of Debye (D) in C.G.S system .Its S.I unit is coulombs x meter (c.m)

Where :

1 D = 3.34 X 10 -30 C.m


Also Read !!

Important mcqs Class 11 Chemistry with Answers Chapter wise

Class 11 Chemistry Chapter Chemical Bonding Important MCQs for Exams (Part 1)

Class 11 Chemistry Chapter Chemical Bonding Important MCQs for Exams ( Part 2)

Class 11 Chapter 1 Some Basic Concepts of Chemistry Important mcqs

Chemistry Class 11 Structure Of Atom Important Multiple Choose Questions (Part 1)

Class 11 Chemistry Chapter 2 Important MCQ’s for Exams – Structure of Atom (Part 2)

Ionic Bond

Covalent Bond

Coordinate Covalent Bond

Metallic Bond 

What is Hydrogen bond -Types of hydrogen bonding with Examples

Why is H+ referred to as a proton?

What are free radicals

What is the difference between Shell , Subshell and Orbital 

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