Answer : The gas formed is Ozone, \(O_3\).
Explanation :
Ozone is the gas which is naturally formed in the stratosphere region.
There are two steps involved in the ozone formation :
Step 1 : The oxygen molecule breaks into two separate oxygen atoms in the presence of sunlight.
\(O_2\overset{h
u}\rightarrow O+O\)
Step 2 : These two separate oxygen atom further react with the oxygen molecule to produce ozone molecule.
\(O+O_2\rightarrow O_3\)
The overall reaction is,
\(3O_2\overset{h
u}\rightarrow 2O_3\)
