Crossword puzzle clue "gas formed from oxygen"

Here are the possible solutions for gas formed from oxygen clue

Answer
Clue
Relevancy
ozone
Clue
Gas formed from oxygen
Definition
an allotropic form of oxygen present in the atmosphere
odor
Clue
Feature of ozone, vis-a-vis oxygen gas
Definition
any smell, whether fragrant or offensive, also ODOUR
ammonia
Clue
Pungent gas formed of nitrogen and hydrogen
Definition
a pungent compound
argon
Clue
Noble gas, and a homophonic hint to how this puzzle's four longest answers are formed
Definition
an inert gaseous element
carbondioxide
Clue
Gas formed by breathing out
firedamp
Clue
Flammable gas formed in coal mines
Definition
a combustible mine gas, mainly methane, that can explode upon contact with a supply of oxygen
methane
Clue
Gas formed by decomposition
Definition
a colourless odourless flammable gas, CH4, the simplest of the alkanes
neon
Clue
Gas in gas station signs
Definition
a gaseous element

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