CBSE Class 11 Chemistry Chemical Bonding and Molecular Structure Assignment

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Assignment for Class 11 Chemistry Chapter 4 Chemical Bonding And Molecular Structure

Class 11 Chemistry students should refer to the following printable assignment in Pdf for Chapter 4 Chemical Bonding And Molecular Structure in Class 11. This test paper with questions and answers for Class 11 Chemistry will be very useful for exams and help you to score good marks

Chapter 4 Chemical Bonding And Molecular Structure Class 11 Chemistry Assignment

Chemical Bonding and Molecular Structure MCQ Questions with Answers Class 11 Chemistry

Question. In a regular octahedral molecule, MXthe number of X – M – X bonds at 180º is

(1) Three

(2) Two

(3) Six

(4) Four

Answer (1)

 

Question. In which of the following molecules all the bonds are not equal?

(1) NF3

(2) CI3

(3) BF3

(4) PF3

Answer (2)

 

Question. Which species does not exhibit paramagnetism?

(1) N 2+

(2) O2

(3) CO

(4) NO

Answer (3)

 

Question. Which of the following molecule stabilizes by removal of electron?

(1) C2

(2) O2

(3) N2

(4) H2

Answer (2)

 

Question. Which of the following statement is correct?

(1) The hybridisation of Cl in ClF3 is sp 2

(2) The number of lone pairs and bond pairs in I 3 – are 2 and 2 respectively

(3) The shape of XeF6 is distorted square bipyramidal

(4) Hybridisation of S is sp 3 in SO 2

Answer (3)

 

Question. In NO ion number of bond pair and lone pair of electrons on nitrogen atom are

(1) 2, 2

(2) 3, 1

(3) 1, 3

(4) 4, 0

Answer (4)

 

Question. Which of the following is correct for XeO2F2 and PCl5 ?

(1) Both have same hybridisation and shape

(2) Both have same hybridisation but different geometry

(3) Both have different hybridisation but same shape

(4) Both have same hybridisation but different shape

Answer (4)

 

Question. Number of nodal planes in π*2px are

(1) Zero

(2) One

(3) Two

(4) Three

Answer (3)

 

Question. Which of the following is not a correct statement?

(1) Multiple bonds are always shorter than corresponding single bonds

(2) The electron-deficient molecules can act as Lewis acids

(3) The canonical structures have no real existence

(4) Every AB5 molecules does in fact have square pyramid structure

Answer (4)

 

Question.  A certain diatomic molecule, AB has dipole moment 1.6 D and the internuclear distance is 100 pm. The percentage of electronic charge existing on more electronegative atom is

(1) 33%

(2) 25%

(3) 50%

(4) 10%

Answer (1)

 

Question. The maximum number of 180° angle possible between X-M-X bond for compounds with sp3 d 2 and sp 3 d hybridisation respectively are

(1) 3, 3

(2) 3, 1

(3) 1, 3

(4) 3, 0

Answer (2)

 

Question. The hybrid orbital having only 20% d character

(1) CCl4

(2) SF6

(3) SF4

(4) Cl2O

Answer (3)

 

 ONE MARK QUESTIONS

1. Atomic orbital is monocentric while a molecular orbital is polycentric”. Explain

2. Explain the term resonance.

3. HF has a higher boiling point than HCl.why?

4. Define hybridization.

5. Write electron dot structures of CO2 and AlCl3.

TWO MARKS QUESTIONS

1 Define the term bond length. Arrange the following in the increasing order of their bond lengths: Ethane, ethene, ethyne

2 Define the term bond angle. Arrange the following in the increasing order of their bond angle: Water, ammonia, methane, carbon dioxide.

3 Which hybrid orbitals are used by the carbon atoms in the following molecules?
a. CH3-CH=CH2
b. CH3-CH2-OH

3 Which hybrid orbitals are used by the carbon atoms in the following molecules?
a. CH3-CH=CH2
b. CH3-CH2-OH
c. CH3CHO
d. CH3COOH

4 What do you understand by formal charge of a molecule? Calculate the formal charges
on all the atoms in the following molecules
i. HClO4
ii. HSO4
5 Differentiate between Bond energy and Bond dissociation energy

THREE MARKS QUESTIONS

1 What are
a) expanded octet molecules?
b) odd electron molecules?
c) Electron deficient molecules?
Give two examples for each.

2 Differentiate between
b) Covalent and Van der Waal’s radius
c) Bonding and antibonding molecular orbital.

3 Draw the resonating structures for the following :
CO32- , NO3- , SO2

4 Give reasons:
a) BF3 is non-polar while NF3 is polar.
b) ClF3 is T-shaped.
c) px orbital does not overlap with py orbital.

5 Justify the following
a) Bonds in ozone are equivalent.
b) Oxygen is paramagnetic.
c) Acetic acid forms dimer.

6 Explain why
a) Para nitro phenol has higher boiling point than ortho nitro phenol.
b) Hydrogen bonding in HCl is insignificant.
c) Bond angle in water is larger than bond angle in H2S

7 Explain the formation of PCl5 and SF6 on the basis of hybridization.

8 Write the molecular orbital electronic configuration for O2- and O2+, Calculate the bond order & comment on their stabilities.

9 Draw orbital overlap diagram for the following:
a)H3O+
b) H2O
c) NH3

10 Which hybrid orbitals are used by the carbon atoms in the following molecules?
a. CH3-CH = CH2
b. CH3-CH2-OH
c. CH3CHO
d. CH3COOH

VALUE BASED QUESTION( FOUR MARKS)

1 The Chemistry teacher was explaining the properties of two hydrides of Sulphur and Oxygen:
H2S and H2O. H2S and H2O are having same hybridization states but different bond angles. H2S
has indefinite volume while H2O has definite volume. H2S cannot be placed in an open
container but H2O can be placed due to their different physical states.
(i) Write the hybridization states of central atom in H2S and H2O.
(ii) What are the physical states ofH2S and H2O?
(iii) Write bond angle of H2O.
(iv) Why H2S and H2O have different bond angles .

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CBSE Class 11 Chemistry Chapter 4 Chemical Bonding And Molecular Structure Assignment

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Assignment for Chemistry CBSE Class 11 Chapter 4 Chemical Bonding And Molecular Structure

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Chapter 4 Chemical Bonding And Molecular Structure Assignment Chemistry CBSE Class 11

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