In the Reactions Involved in the Photodecomposition of Ozone (Shown

Multiple Choice

In the reactions involved in the photodecomposition of ozone (shown below) ,what does M symbolize?
1.O₂ (g) + hν → O (g) + O (g)
2.O (g) + O₂ (g) + M (g) → O₃ (g) + M^* (g)
3.O₃ (g) + hν → O₂ (g) + O (g)
4.O (g) + O (g) + M (g) → O₂ (g) + M^* (g)

A) mesosphere
B) metal
C) molybdenum
D) methane
E) molecule