CBSE Class 11 Chemistry Chemical Bonding And Molecular Structure Worksheet Set A

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Chapter 4 Chemical Bonding and Molecular Structure Chemistry Worksheet for Class 11

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Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure Worksheet Pdf

Question. B.P. of H2 O(100ºC) and H2 S(−42ºC) explained by:
a. Vander Waal's forces
b. Covalent bond
c. Hydrogen bond
d. Ionic bond
Answer : C

Question. In which of the following compounds intramole-cular hydrogen bond is present?
a. Ethyl alcohol
b. Water
c. Salicylaldehyde
d. Hydrogen sulphide
Answer : C

Question. Hydrogen bonding is formed in compounds containing hydrogen and: 
a. Highly electronegative atoms
b. Highly electropositive atoms
c. Metal atoms with d-orbitals occupied
d. Metalloids
Answer : A

Question. Which contains strongest H-bond?
a. O−H.....S
b. S−H.....O
c. F −H.....F
d. S−H.....O
Answer : C

Question. Which of the following hydrides are ionic?
a. CaH2
b. BaH2
c. SrH2
d. BeH2
Answer : ABC

Question. Which of the following conduct electricity in the fused state?
a. BeCl2
b. MgCl2
c. SrCl2
d. BaCl2
Answer : BCD

Question. CO32− anion has which of the following characteristics:
a. Bonds of unequal length
b. 2 sp hybridization of C atom
c. Resonance stabilization
d. Same bond angles
Answer : ALL

Question. Select the compound from the following which dissolves in water?
a. CCl4
b. CS2
c. CHCl3
d. C2H5OH
Answer : D

Question. Which molecule does not show zero dipole moment?
a. BF3
b. NH3
c. CCl4
d. CH4
Answer : B

Question. The dipole moment of HBr is 1.6 x 10−30 cm and interatomic spacing is 1Å. The % ionic character of HBr is:
a. 7
b. 10
c. 15
d. 27
Answer : B

Question. Which one of the following molecules is expected to exhibit diamagnetic behavior?
a. C2
b. N2
c. O2
d. S2
Answer : AB

Question. Dipole moment is shown by:
a. 1, 4-dichlorobenzene
b. cis-1, 2- dichlorobenzene
c. trans-1, 2- dichlorobenzene
d. trans-1, 2-dichloro-2-pentene
Answer : BD

Question. Hydrogen bonding plays a central role in the following phenomena:
a. ice floats in water
b. higher Lewis basicity of primary amines than tertiary amines in aqueous solutions
c. formic acid is more acidic than acetic acid
d. dimeristaion of acetic acid in benzene
Answer : ABD

Question. Formula of a metallic oxide is MO. The formula of its phosphate will be:
a. M2(PO4)2
b. M(PO4)
c. M2PO4
d. M3(PO4)2
Answer : D

Question. The electronic structure of four elements A, B, C, D are:
a. 1s2
b. 1s2 , 2s2 2p2
c. 1s2 , 2s2 2p5
d. 1s2 , 2s2 2p6
Answer : C

Question. If HCl molecule is completely polarized, so expected value of dipole moment is 6.12D (deby), but experimental value of dipole moment is 1.03D. Calculate the percentage ionic character:
a. 17
b. 83
c. 50
d. Zero
Answer : A

Question. Which bond angle θ would result in the maximum dipole moment for the tri-atomic molecule YXY?
a. θ = 90o
b. θ = 120o
c. θ = 150o
d. θ = 180o
Answer : A

Question. Which molecules has zero dipole moment?
a. H2O
b. CO2
c. HF
d. HBr
Answer : B

Question. CO2 is isostructural with:
a. HgCl2
b. C2H2
c. SnCl2
d. NO2
Answer : AB

Question. The linear structure assumed by:
a. SnCl2
b. CS2
c. NO2+
d. NCO
Answer : BCD

Question. Which of the following have identical bond order?
a. CN
b. O2
c. NO+
d. CN+
Answer : AC

Question. The molecules that will have dipole moment are:
a. 2, 2-dimethyl propane
b. trans-2pentene
c. cis-3-hexene
d. 2, 2, 3, 3-tetramethyl butane
Answer : BC

Assertion and Reason

Note: Read the Assertion (A) and Reason (R) carefully to mark the correct option out of the options given below:
a. If both assertion and reason are true and the reason is the correct explanation of the assertion.
b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
c. If assertion is true but reason is false.
d. If the assertion and reason both are false.
e. If assertion is false but reason is true.

Question. Assertion: All F – S – F angle in SF4 greater than 90° but less than 180°
Reason: The lone pair-bond pair repulsion is weaker than bond pair-bond pair repulsion

Answer : C

Question. Assertion: Water is liquid but H2S is a gas.
Reason: Oxygen is paramagnetic.

Answer : B

Question. Assertion: The fluorine has lower reactivity.
Reason: F – F bond has low bond dissociation energy.

Answer : C

Question. Assertion: Nitrogen molecule diamagnetic.
Reason: N2 molecule have unpaired electrons.

Answer : C

Question. Assertion: Ice is less dense than liquid water.
Reason: There are vacant spaces between hydrogen bonded water molecules in ice.

Answer : A

Question. Assertion: Born-Haber cycle is based on Hess’s law.
Reason: Lattice enthalpy can be calculated by Born- Haber cycle.

Answer : B

Question. Assertion: Iodine is more soluble in water then in carbon tetrachloride.
Reason: Iodine is a polar compound.

Answer : D

Question. Assertion: o and p-nitrophenols can be separated by steam distillation.
Reason: o-nitrophenol has intra-molecular hydrogen bonding while p-nitrophenol exists as associated molecules.

Answer : A

Question. Assertion: Electron affinity refers to an isolated atom’s attraction for an additional electron while electro-negativity is the ability of an element to attract electrons towards itself in a shared pair of electrons.
Reason: Electron affinity is a relative number and electronegativity is experimentally measurable.

Answer : C

Question. Assertion: Geometry of SF4 molecule can be termed as distorted tetrahedron, a folded square or see saw.
Reason: Four fluorine atoms surround or form bond with sulphur molecule.

Answer : B

Comprehension Based

Paragraph

Dipole moment of a bond is a vector and physical quantity to calculate the percentage ionic character in a covalent bond. It is expressed as Dipole moment (μ) = δ × 4
Where, δ is dipole moment and d is the bond length.
It is usually expressed in terms of CGS unit known ad Debye
(D)1D= 10–18 esu cm. In SI unit it is expressed in Coulomb meter. Resultant dipole moment  (μR) of two bond moment (μ1 and μ2) acting at angle θ, is given by: μR = √μ21+ μ22 + 2μ1μ2 cosθ
If μ1 = μ2 , also if cos θ = 1, i.e., θ =180° then μ = 0
(molecule is nonpolar) If μ ≠ 0 molecule is polar.
Dipole moment plays an important role in deciding the stability order of alkanes, i.e., a more stable alkane has less dipole moment. The dipole moment of a molecule can predict the geometrical and position isomers as well as orientations in benzene nucleus and polarity of molecule.

Question. Dipole moment of HCl molecule is found to be 0.186 D. Assuming HCl bond length to be equal to 1Å, the % ionic character of HCl molecule is:
a. 10%
b. 17%
c. 27%
d. 37
Answer : B

Question. The correct increasing order of dipole moment of the following compounds is:
(I) toluene (II) o-dichlorobenzene
(III) m-dichlorobenzene (Iv) p-dichlorobenzene
a. I < II < III < IV
b. IV < I < III < II
c. I < IV < III < II
d. IV < I < II < II
Answer : B

Question. Dipole moment of (1) p-dinitrobenzene, (2) p-dichlorobenzene and (3) p-dimethoxybenzene are in the order:
a. 3 > 2 > 1
b. 3 = 2 > 1
c. 3 = 2 = 1
d. 3 > (2 = 1)
Answer : D

Question. Identify the correct increasing order of the stability of thefollowing alkenes, (I) cis-2-butene; (II) trans-2-butene; (III) Isobutene:
a. II < III < I
b. I < III < II
c. I < II < III
d. III < II < I
Answer : D

Question. Which of the following species is no polar?
a. Ammonia
b. Sulphur dioxide
c. Water
d. Sulphur trioxide
Answer : D

Question. The increasing order of dipole moment of bond in halogen acids is:
a. HF > HCl >HBr> HI
b. HI > HCl >HBr> HF
c. HCl > HBr >HIr> HF
d. HI > HBr >HF> HCl
Answer : A

Question. Which molecular is non-polar?
a. trans-Pent-2-ene
b. cis-Pent-2-ene
c. cis-1-chloroporopne
d. SF6
Answer : D

Question. Which species is polar?
a. trans-Hex-3-ene
b. trans-But-2-ene
c. PCl5
d. XeF6
Answer : D

Integer

Question. The total number of lone-pairs of electrons in melamine is:
Answer : 6

Question. The number of lone pairs in 4 BF− is …………….
Answer : 12

Question. The maximum number of atoms that may lie in the same plane in (CH3)2C = SF2 (CH3)2 is …………….
Answer : 8

Question. The sum of oxidation states of N atoms in the following compounds of nitrogen is ………......…….NH3, N2H4, NH2OH, N2, N2O, NO, N2O3, NO2, N2O5.
Answer : 9

Question. The number of nodal planes when two dxy orbitals from two atoms produce antibonding δ bonds is
Answer : 3

Question. Based on VSEPR theory, the number of 90° F − Br − F angles in BrF5 is:
Answer : 0

CHEMICAL BONDING AND MOLECULAR STRUCTURE
 
1. “Atomic orbital is monocentric while a molecular orbital is polycentric”. Explain.
 
2. What are
a) Expanded octet molecules?
b) Odd electron molecules?
c) Electron deficient molecules?
Give two examples for each.
 
3. Differentiate between
a) Bond energy and Bond dissociation energy
b) Covalent and Van der Waal’s radius
c) Bonding and antibonding molecular orbital.
 
4. Explain resonance and draw the resonating structures for the following :
CO3 2- , NO3- , SO2 , C6H6
 
5. 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.
d) Bonds in ozone are equivalent.
e) Oxygen is paramagnetic.
f) Acetic acid forms dimer.
g) Para nitro phenol has higher boiling point than ortho nitro phenol.
h) Hydrogen bonding in HCl is insignificant.
i) Bond angle in water is larger than bond angle in H2S
j) HF has a higher boiling point than HCl.
 
6. Explain the formation of PCl5 and SF6 on the basis of hybridization.
 
7. Write the energy level diagram for O2- and O2 +. Calculate the bond order.
 
8. Draw orbital overlap diagram for the following:
a)H3O+
b) H2O2
c) NH3
 
9 Which is more polar and why: NH3 and NF3
 
10) Define the term bond length. Arrange the following in the increasing order of their bond lengths:
Ethane, ethene, ethyne
 
11) Define the term bond angle. Arrange the following in the increasing order of their bond angle: Water, ammonia, methane, carbon dioxide
 
12) 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
 
13) 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-
 
14) Discuss the shapes of the following molecules using VSEPR model
BCl3, H2O, XeF4, SF4, NH4+
 
15) Predict the hybridization in the following molecules H2O, NH4+, SO42-, ClO3-, IF5

 

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Chapter 4 Chemical Bonding and Molecular Structure CBSE Class 11 Chemistry Worksheet

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