• Chapter 4 - Chemical Bonding and Molecular Structure Assignments 1

    Which of the following statements is correct?
    (i) In the formation of dioxygen from oxygen atoms 10 molecular orbitals
    will be formed.
    (ii) All the molecular orbitals in the dioxygen will be completely filled.
    (iii) Total number of bonding molecular orbitals will not be same as total
    number of anti bonding orbitals in dioxygen.
    (iv) Number of filled bonding orbitals will be same as number of filled anti
    bonding orbitals.

    Uploaded bysunilsunil         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 2

    Assertion (A): Among the two O–H bonds in H2O molecule, the energy
    required to break the first O–H bond and the other O–H bond
    is the same.
    Reason (R) : This is because the electronic environment around oxygen is
    the same even after breakage of one O–H bond.
    (i) A and R both are correct, and R is correct explanation of A.
    (ii) A and R both are correct, but R is not the correct explanation of A.
    (iii) A is true but R is false.
    (iv) A and R both are false.

    Uploaded bysunilsunil         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 3

    Assertion (A) : Though the central atom of both NH3 and H2O molecules are
    sp3 hybridised, yet H–N–H bond angle is greater than that of
    H–O–H.
    Reason (R) : This is because nitrogen atom has one lone pair and oxygen
    atom has two lone pairs.
    (i) A and R both are correct, and R is the correct explanation of A.
    (ii) A and R both are correct, but R is not the correct explanation of A.
    (iii) A is true but R is false.
    (iv) A and R both are false.

    Uploaded bysunilsunil         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 4

    In the following questions a statement of Assertion (A) followed by a statement of
    Reason (R) is given. Choose the correct option out of the choices given below each
    question.

     Assertion (A) : Sodium chloride formed by the action of chlorine gas on
    sodium metal is a stable compound.
    Reason (R) : This is because sodium and chloride ions acquire octet in
    sodium chloride formation.
    www.tiwariacademy.com
    Exemplar Problems, Chemistry 48
    (i) A and R both are correct, and R is the correct explanation of A.
    (ii) A and R both are correct, but R is not the correct explanation of A.
    (iii) A is true but R is false.
    (iv) A and R both are false.

    Uploaded bysunilsunil         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 5

    NH 3 has higher boiling point than PH3 . Give reason.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 6

    What are the types of H-bonding? Which of them is stronger?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 7

    Define hydrogen bonding 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 8

    Define bond order.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 9

    He2does not exist. Explain in terms of LCAO

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 10

    Why are bonding molecular orbitals more stable than antibonding molecular
    orbitals?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 11

    Which one

    O2 and O2-2 , - may exhibit paramagnetism?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 12

    Explain diagrammatically the formation of molecular orbital by LCAO.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 13

    Define antibonding molecular orbital.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 14

    Define bonding molecular orbital.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 15

    Out of p-orbital and sp-hybrid orbital which has greater directional character
    and Why?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 16

    What type of hybridisation takes place in (i) p in PCL5 and (ii) S in S F6?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 17

    In H2O, H2S, H2Se, H2Te, the bond angle decreases though all have the same bent

    shape. Why?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 18

    Ethylene is a planar molecule whereas acetylene is a linear molecule. Give
    reason.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 19

    What is the state of hybridization of carbon atoms in diamond and graphite?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 20

    State the hybrid orbitals associated with B in BCl3 and C in C2H4

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 21

    Describe the shape of sp, sp2 and sp3 hybrid orbital? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 22

    What are the important consolations for hybridisation? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 23

    Give the features of hybridisation. 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 24

    Define hybridisation. 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 25

    What is zero over lap?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 26

    How do covalent bonds form due to orbital overlapping?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 27

    What type of bond are formed due to orbital overlap?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 28

    What are the different types of s - bond formation?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 29

    What type of bond exists in multiple bond (double / triple)?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 30

    How many s - and p - bonds are there in a molecule of CH2 = CH – CH = CH2 ?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 31

    How many s – and p - bond are there in a molecule of C2H4 (ethane )? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 32

    Why is s– bond stronger than p - bond?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 33

    What is pi – bond?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 34

    What is sigma bond?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 35

    S – orbital does not show any preference for direction. Why? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 36

    How is VBT different from Lewis concept? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 37

    In SF4 molecule, the lp electrons occupies an equatorial position in the trigonal

    bipyramidal arrangement to an axial position. Give reason

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 38

    How would you attribute the structure of PH3 molecule using VSEPR model? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 39

    Why does H2O have bent structure? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 40

    CO2 is linear whereas SO2 is bend – shaped. Give reason

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 41

    . What’s difference between lone pair and bonded pair of electrons? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 42

    Give the main features of VSEPR Theory

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 43

    Dipole moment of Be F2 is zero. Give reason. 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 44

    On which factor does dipole moment depend in case of polyatomic

    molecules.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 45

    Draw the resonating structure of NO3

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 46

    Write the resonating structure of O3 molecule. 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 47

    Why is BF3 non – polar? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 48

    Why is dipole moment of CO2, BF3, CCl4 is zero? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 49

    Why NH3 has high dipole moment than NF3 though both are pyramidal? 

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 50

    Dipole moment is a scalar or a vector quantity?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 51

    Give the mathematical expression of dipole moment

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 52

     Define dipole moment

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 53

    Define covalent radius.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 54

    Out of covalent and hydrogen bonds, which is stronger.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 55

    What type of bond is formed when atoms have high difference of
    electornegativity?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 56

    . How would the bond lengths vary in the following species? C2, C2

    - C22

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 57

    Give reason why H2

    + ions are more stable than H2

    - though they have the same

    bond order.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 58

    Define bond order.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 59

    Which one of the following has the highest bond order? N2, N2

    + or N2

    -.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 60

    Mention the factors that influence the formation of an Ionic bond.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 61

    What changes are observed in atoms undergoing ionic bonding?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 62

    Define an ionic bonding.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 63

    Give the Lewis dot structure of HNO3

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 64

    Write the Lewis structure for CO molecule

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 65

    Write the significance of octet rule.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 66

    Give the octet rule in short.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 67

    Define electrovalent bond.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 68

    How can you explain the formation of NaCl according to kossel concept?

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 69

    Give the main feature of Kossel’s explanation of chemical bonding.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 70

    Write electron dot structure (Lewis structure) of Na, Ca, B, Br, Xe, As, Ge, N3-.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 71

    Give the main feature of Lewis approach of chemical bonding.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 72

    Define a chemical bond.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 73

    Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 74

    Describe the hybridisation in case of PCl5. Why are the axial bonds longer as compared to equatorial bonds?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 75

    Write the significance of a plus and a minus sign shown in representing the orbitals.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 76

     

    Compare the relative stability of the following species and indicate theirmagnetic properties;

    O2,,(superoxide), (peroxide)

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 77

    Use molecular orbital theory to explain why the Be2molecule does not exist.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 78

    Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 79

    Explain the formation of H2molecule on the basis of valence bond theory.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 80

    Distinguish between a sigma and a pi bond.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 81

    What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one example of each type.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 82

    Which hybrid orbitals are used by carbon atoms in the following molecules?

    CH3-CH3; (b) CH3-CH=CH2; (c) CH3-CH2-OH; (d) CH3-CHO (e) CH3COOH

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 83

    Considering x-axis as the internuclear axis which out of the following will notform a sigma bond and why? (a) 1s and 1s (b) 1s and 2px(c) 2pyand 2py(d) 1s and 2s.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 84

      

    What is the total number of sigma and pi bonds in the following molecules?

    (a) C2H2(b) C2H4

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 85

    Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in C2H4and C2H2molecules.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 86

      

    Is there any change in the hybridisation of B and N atoms as a result of the following reaction?

    BF3+ NH3 → F3B.NH3

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 87

     

    What is meant by hybridisation of atomic orbitals? Describe the shapes of sp, sp2, sp3hybrid orbitals.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 88

    Which out of NH3and NF3has higher dipole moment and why?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 89

    Explain why BeH2molecule has a zero dipole moment although the Be-H bonds are polar.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 90

    Apart from tetrahedral geometry, another possible geometry for CH4is square planar with the four H atoms at the corners of the square and the C atom at its centre. Explain why CH4is not square planar?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 91

     

    The skeletal structure of CH3COOH as shown below is correct, but some of the bonds are shown incorrectly. Write the correct Lewis structure for acetic acid.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 92

    Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2, SO2and ClF3.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 93

    Explain with the help of suitable example polar covalent bond.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 94

    Define electronegativity. How does it differ from electron gain enthalpy?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 95

    Write the significance/applications of dipole moment.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 96

    Although both CO2and H2O are triatomic molecules, the shape of H2O molecule is bent while that of CO2is linear. Explain this on the basis of dipole moment.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 97

    Use Lewis symbols to show electron transfer between the following atoms to form cations and anions: (a) K and S (b) Ca and O (c) Al and N.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 98

      

    H3PO3can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing H3PO3? If not, give reasons for the same.

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 99

    Define the bond length.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 100

    How do you express the bond strength in terms of bond order?

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 101

    Although geometries of NH3and H2O molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 102

    Discuss the shape of the following molecules using the VSEPR model:

    BeCl2, BCl3, SiCl4, AsF5, H2S, PH3

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 103

    Write the favourable factors for the formation of ionic bond.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 104

    Define octet rule. Write its significance and limitations.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 105

    Draw the Lewis structures for the following molecules and ions:

    H2S, SiCl4, BeF2,, HCOOH

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 106

     

    Write Lewis symbols for the following atoms and ions:

    S and S2-; Al and Al3+; H and H-

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 107

    Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

     

    Uploaded bysandeepsandeep         View Answer

  • Chapter 4 - Chemical Bonding and Molecular Structure Assignments 108

    Explain the formation of a chemical bond.

     

    Uploaded bysandeepsandeep         View Answer

    • Description:-

    Lecture 6: Revison
    In the last class, we had completed our Chapter 4 - Chemical Bonding and Molecular
    . Now today, you are going to revise the whole chapter through summary of the chapter, key points and practice paper, HOTS 
    Please go through all the topics which we had studied till now, their notes. Properly do the assignments, watch videos of the concerned topics.
    If you have any doubt about any topic/point please submit it in the discussion section... it will be answered as soon as possible.
    Now ...you can attempt quiz given of this chapter to check your concept clearance about the chapter.

    x
    Login/Registration