Nitrogen

Question 1

N2O

Answer 1

Dinitrogen oxide, nitrous oxide, nitrogen(I) oxide

Laughing gas - sweet smell

Colourless

Question 2

NO2

Answer 2

Nitrogen dioxide, nitrogen(IV) oxide

Brown gas, sharp odour, toxic

Question 3

Nitrate(III) ion

Answer 3

NO2-
Nitrite ions in the soil
Ammonium compounds via nitrosommonas

Question 4

Nitrate(V) ions

Answer 4

NO3-
Nitrate ions
Via nitrite ions using nitrobacter

Question 5

NO

Answer 5

Nitrogen oxide, nitric acid, nitrogen (II) oxide

Colourless gas