chemistry - chemical bonding and molecular structure

Class 11 - Chemistry

Chemical Bonding and Molecular Structure

MCQ
Q&A
Question:

Predict the shapes of the following molecules using VSEPR theory?
(i) BeCl2(ii) SiCl4

Answer:

(i) Linear
(ii) Tetrahedral



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Questions and Answers


Chemical Bonding and Molecular Structure - Questions
1.

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


Answer
2.

Write Lewis symbols for the following atoms and ions: S and  S2– ; Al and  Al3+; H and H


Answer
3.

Draw the Lewis structures for the following molecules and ions:
H2S, SiCl4 ,  BeF2, C032-, HCOOH


Answer
4.

Define Octet rule. Write its significance and limitations.


Answer
5.

Write the favourable factors for the formation of ionic bond.


Answer
6.

Discuss the shape of the following molecules using the VSEPR model:
BeCl2, BCl3 , SiCl4, AsF5, H2S, PH3


Answer
7.

Although geometries of NH3  and H20 molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.


Answer
8.

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


Answer
9.

Define the bond-length.


Answer
10.

Explain the important aspects of resonance with reference to the  C032-ion.


Answer
11.

Write the resonance structures for SO3,NO2 and NO3


Answer
12.

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.


Answer
13.

Although both CO2 and H2O are triatomic molecules, the shape of H2O molecule is bent while that of CO2 is linear. Explain this on the basis of dipole moment.


Answer
14.

Write the significance/applications of dipole moment.


Answer
15.

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


Answer
16.

Explain with the help of suitable example polar covalent bond.


Answer
17.

Arrange the bonds in order of increasing ionic character in the molecules: LiF, K2O, N2, SO2 and ClF3.


Answer
18.

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.
ncert-solutions-for-class-11-chemistry-chapter-4-chemical-bonding-and-molecular-structure-12


Answer
19.

Apart from tetrahedral geometry, another possible geometry for CH4 is square planar with the four H atoms at the comers of the square and the C atom at its centre. Explain why CH4 is not square planar?


Answer
20.

Explain why BeH2 molecule has a zero dipole moment although the Be—H bonds are polar.


Answer
21.

Which out of NH3 and NF3 has higher dipole moment and why?


Answer
22.

What is meant by hybridisation of atomic orbitals? Describe the shapes of sp, sp2, sp3 hybrid orbitals.


Answer
23.

Describe the change in hybridisation (if any) of the Al atom in the following reaction.  AlCl3 + Cl ——>AlCl4- .


Answer
24.

Is there any change in the hybridisation ofB and N atoms as a result of the following reaction ?  BF3 + NH3 ——-> F3 B.NH3


Answer
25.

Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in  C2 H4 and  C2 H2  molecules.


Answer
26.

What is the total number of sigma and pi bonds in the following molecules?
(a) C2 H2 (b) C2 H4


Answer
27.

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


Answer
28.

Distinguish between a sigma bond and a pi bond.


Answer
29.

Explain the formation of  H2 molecule on the basis of valence bond theory.


Answer
30.

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


Answer
31.

Compare the relative stability of the following species and indicate their magnetic properties: O2, O2, O2 (Superoxide),O22- (peroxide)


Answer
32.

Write the significance of plus and minus sign in representing the orbitals,


Answer
33.

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


Answer
34.

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


Answer
35.

What is meant by the term bond order? Calculate the bond order of  N2, O2, O2+,O2


Answer
36.

How is bond order related to the stability of a molecule?


Answer
37.

Write the type of hybridisation involved in  CH4,C2H4  and C2H2.


Answer
38.

Out of sigma and Π  bonds, which one is stronger and why?


Answer
39.

Write the Lewis dot symbols of the following elements and predict their valencies.  (i) Cl (ii) P


Answer
40.

Write the state of hybridisation of boron in  BF3.


Answer
41.

Arrange  O2,O2,O22-, O2+in increasing order of bond energy.


Answer
42.

What is meant by bond pairs of electrons?


Answer
43.

Define covalent bond according to orbital concept?


Answer
44.

Why  B2  is paramagnetic in nature while C2 is not?


Answer
45.

Why ethyl alcohol is completely miscible with water?


Answer
46.

Which is more polar CO2  or  N2O? Give reason.


Answer
47.

Why  N2  is more stable than  O2? Explain on the basis of molecular orbital theory.


Answer
48.

How is bond order related to bond length of a molecule?


Answer
49.

Define antibonding molecular orbital.


Answer
50.

Name the two conditions which must be satisfied for hydrogen bonding to take place in a molecule.


Answer
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