Answer:
A
Explanation:
Noble gases are already stable
And since Argon is a noble gas it is stable
Approximating 7 to 20 kilometers
Hope this helps
Hello! Your answer will be C. If you need an explanation let me know!
When the cool and hot zones of a non luminous flame’s air
control valve is closed, the gas in which will be in placed as first and as it
encounters air as it was in the mouth of the burner, there will be a presence
of incomplete mixing, causing a combustion which would be incomplete and will
also lead to a process that can’t be controlled, resulting to flame that is
cool.
