Question

Question 5
The two forms of oxygen found in the atmosphere are

(a) water and ozone
(b) water and oxygen
(c) ozone and oxygen
(d) water and carbon-dioxide​​​​​​​

Answer 1

(c) ozone and oxygen
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Elemental oxygen is normally found in the form of a diatomic molecule. However, in the upper reaches of the atmosphere, a molecule containing three atoms of oxygen is found, which is called as ozone.