Is oxygen gas freely available in the atmosphere?

Carbon cycle Is carbon dioxide gas freely available in the atmosphere?

Moisture present in the atmosphere

The CO_2 content in the atmosphere is

The most abundant noble gas in the atmosphere is

In spite of lack of free oxygen in primitive atomosphere of the earth how present atmosphere contain free oxygen?

Oen litre of oxygen at a pressure of one atmosphere and two litres of nitrogen at a pressure of 0.5 atmosphere are introduced into a vessel of 1 litre capacity , with out any change in the temperature. The total pressure would be

A planet with the diameter and mass, both one third of those of the earth has surface temperature around 1000 K. Is it possible to find oxygen molecules around the atmosphere of the planet? (Given: Boltzmann constant = 1.38 xx 10^-23 J/K , Mass of oxygen molecule = 5.3 xx 10^-26 kg )

Which gas was absent in the atmosphere at the time of origin of life?

If oxygen gas is introduced between the pole pieces of a magnet ________.