Ncert Exercises & Solutions

Match the items given in Column I with examples given in Column II.

Column I	Column II
A. Hydrogen bond	1. C
B. Resonance	2. LiF
C. Ionic solid	3. H₂
D. Covalent solid	4. HF
	5. O₃

Codes

Options:	A	B	C	D
1.	2	3	4	1
2.	1	2	3	5
3.	5	4	3	2
4.	4	5	2	1

Hint: In ozone resonance takes place

A.
Hydrogen bonding is a special type of dipole-dipole attraction between molecules. It results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
Hence, HF show hydrogen bonding.

B.O₃ is known as ozone. In O₃ resonance takes place. The resonating structure of O₃ is as follows:

C. An ionic bond is formed by the complete transfer of some electrons from one atom to another.

Metal and non-metal combine and form ionic compound. In LiF, ionic bond is present.

D. Solid C is an example of covalent solid because atoms are connected with each other by covalent bonding.

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