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CBSE - Class 11 Chemistry Chemical Bonding and Molecular Structure Worksheet

1.
Explain why $BeH_2$ molecule has a zero dipole moment although the Be–H bonds are polar.
2.

How many Sigma or pi bonds are there in oxygen molecule?

a.

1sigma 1pi bond

 b.

2pi bond

 c.

2sigma bond

 d.

None of these
3.
Explain the formation of a chemical bond.
4.
Write Lewis dot symbols for atoms of the following elements : Mg, Na, B, O, N, Br.
5.
What do you understand by bond pairs and lone pairs of electrons? Illustrate by giving one exmaple of each type.
6.

Structure of Ni(CO)4

a.

Square planar

 b.

Butterfly

 c.

Tetrahedral

 d.

Molecule does not exist
7.
Although geometries of $NH_3$ and $H_2O$ molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.
8.

Total no of lone pair of electron in given structure

a.

O

 b.

1

 c.

2

 d.

3
9.

Pi bond is more stronger than Sigma bond.

a. True b. False
10.

HYBRIDIZATION OF H2SO4 IS

a.

SP2

 b.

SP3

 c.

SP3D

 d.

SP3D2
11.
How do you express the bond strength in terms of bond order ?
12.
Write Lewis symbols for the following atoms and ions: S and $S^{2-}$; Al and $Al^{3+}$; H and $H^{-}$
13.

  1. Which of the following molecules has pentagonal bipyramidal shape

a.

PF5 

 b.

 IF7­                    

 c.

   XeF6                   

 d.

 [Fe (CN)6]3-
14.
What is the total number of sigma and pi bonds in the following molecules? (b) $C_2H_4$
15.
Which hybrid orbitals are used by carbon atoms in the following molecules? (e) $CH_3COOH$
16.

Which is not Retentate?

a.

Proteins

 b.

Polysaccharides

 c.

Phosphates

 d.

Lipids
17.

The mass of carbon anode consumed giving only carbon dioxide in the production of 270 kg of aluminium metal from bauxite by the Hal process is (at at. Mass of Al = 27)

a.

180 kg

 b.

270 kg

 c.

540 kg

 d.

90 kg
18.
Which hybrid orbitals are used by carbon atoms in the following molecules? (d) $CH_3-CHO$
19.
Explain with the help of suitable example polar covalent bond.
20.

$H_3PO_3$ can be represented by structures 1 and 2 shown below. Can these two structures be taken as the canonical forms of the resonance hybrid representing $H_3PO_3$ ? If not, give reasons for the same.

Worksheet Answers

2.
Option A
6.
Option C
8.
Option B

Solution:

9.
Option B
10.
Option B
13.
Option B
16.
Option C
17.
Option A
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