chapter 7.  ELEMENTS OF GROUPS 16, 17 AND 18 class 12 chemistry textbook solution

3. Answer the following.

xix. Describe the structure of Ozone. Give two uses of ozone.


The ozone (O3) molecule consists of three oxygen atoms arranged in a bent or V-shaped structure. Each oxygen atom in ozone is bonded to the adjacent oxygen atoms by covalent bonds. The central oxygen atom is bonded to two other oxygen atoms, and these bonds involve the sharing of electrons between the atoms. The Lewis structure of ozone can be represented as follows, where the lines represent covalent bonds, and the dots represent valence electrons:

In this representation, the central oxygen atom forms a double bond with one of the oxygen atoms and a single bond with the other oxygen atom. This results in the bent or V-shaped structure of the ozone molecule.

Two common uses of ozone are:

  1. Water Purification: Ozone is a powerful oxidizing agent and is used for water purification and treatment. It can effectively disinfect water by destroying bacteria, viruses, and other microorganisms. Ozone treatment is an environmentally friendly alternative to chlorine disinfection because it does not produce harmful chlorinated byproducts. Ozone can also remove color, taste, and odor-causing compounds from water.

  2. Ozone Therapy in Medicine: Ozone therapy involves the controlled administration of ozone gas for medical purposes. It is used in various medical treatments, including wound healing, dental procedures, and the treatment of certain medical conditions. Ozone therapy is believed to have potential therapeutic benefits, although its use is subject to regulation and may vary by country.

Ozone’s ability to absorb and scatter ultraviolet (UV) radiation in the Earth’s stratosphere also plays a crucial role in protecting life on Earth by forming the ozone layer. The ozone layer absorbs the majority of the harmful UV-B and UV-C radiation from the sun, preventing it from reaching the Earth’s surface and shielding living organisms from the damaging effects of excessive UV radiation.

chapter 7.  ELEMENTS OF GROUPS 16, 17 AND 18 Textbook Solution page 164