About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?

Question

About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true? (A) Ozone is a triatomic linear molecule (B) It is harmful as it stops useful radiation (C) It is beneficial to us as it stops UV-radiation (D) Conversion of O3 to O2 is an endothermic reaction

Tardigrade Admin · Accepted Answer

Ozone is an allotropic form of oxygen. It is present in the upper atmosphere (about 20 km above the surface of the earth). It is believed to be formed in the upper atmosphere by the action of UV-rays on oxygen as 3O2 + UV-rays longrightarrow 2O3, Δ H = 142.7 kJ mol-1 Therefore, UV-rays, which are harmful to human beings are absorbed by oxygen to form ozone. The layer of ozone, thus formed also prevents the remaining UV-rays to reach the earth- surface.

Q. About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?

Ozone is a triatomic linear molecule

It is harmful as it stops useful radiation

It is beneficial to us as it stops UV-radiation

Conversion of $O_{3} t o O_{2}$ is an endothermic reaction

Q. About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?

Ozone is a triatomic linear molecule

It is harmful as it stops useful radiation

It is beneficial to us as it stops UV-radiation

Conversion of O3​toO2​ is an endothermic reaction

Conversion of $O_{3} t o O_{2}$ is an endothermic reaction