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CBSE - Class 11 Chemistry Chemical Bonding and Molecular Structure Worksheet

1.
What is meant by the term bond order? Calculate the bond order of : $N_2$, $O_2$, $O_2^+$ and $O_2^-$.
2.
What is the total number of sigma and pi bonds in the following molecules? (b) $C_2H_4$
3.
Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (c) Al and N.
4.
Define the bond length.
5.
What is meant by hybridisation of atomic orbitals? Describe the shapes of $sp$, $sp^2$, $sp^3$ hybrid orbitals.
6.
Which out of $NH_3$ and $NF_3$ has higher dipole moment and why ?
7.
How do you express the bond strength in terms of bond order ?
8.
Describe the hybridisation in case of $PCl_5$. Why are the axial bonds longer as compared to equatorial bonds?
9.
Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in $C_2H_4$ and $C_2H_2$ molecules.
10.
Write the resonance structures for $SO_3$, $NO_2$ and $NO_3^{-}$.
11.

$H_3PO_3$ 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.

12.
Which hybrid orbitals are used by carbon atoms in the following molecules? (c) $CH_3-CH_2-OH$
13.
Explain the important aspects of resonance with reference to the $CO_3^{2-}$ ion.
14.
Which hybrid orbitals are used by carbon atoms in the following molecules? (d) $CH_3-CHO$
15.
Explain the formation of $H_2$ molecule on the basis of valence bond theory.
16.
Which hybrid orbitals are used by carbon atoms in the following molecules? (a) $CH_3–CH_3$
17.
Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (b) Ca and O
18.
Define octet rule. Write its significance and limitations.
19.
Use Lewis symbols to show electron transfer between the following atoms to form cations and anions : (a) K and S
20.
Distinguish between a sigma and a pi bond.

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