Question

which two facts are true about the gas ozone
a ozone in the stratosphere produced harmful physical effects for humans
b ozone in the troposphere is called bad ozone
c ozone in the stratosphere is a protective layer from harmful radiation from the sun
d ozone is formed by combing oxygen and hydrogen

Answer 1

The two true facts about the gas ozone are:

**B**: Ozone in the troposphere is called bad ozone.
**C**: Ozone in the stratosphere is a protective layer from harmful radiation from the sun.

Option A is incorrect because ozone in the stratosphere is beneficial, protecting us from harmful UV radiation, while option D is incorrect because ozone is formed by combining oxygen molecules (O2) in the presence of sunlight, not hydrogen.