Question

Which component of the air is an element? a. H2O b. NO2 c. O2 d. CO2

Answer 1

b. NO2

Step-by-step explanation:

Air is made of mostly nitrogen and oxygen. N(nitrogen) o2( oxygen)

Answer 2

C. O2

Step-by-step explanation:

H2O, NO2, CO2 are all compounds

O2 is the only non combined single element