We cannot see the oxygen that we breathe. It is freely available in the air, from which it is obtained for industrial purposes by liquifying it. Liquid oxygen:

is blue in colour

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looks like water

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is invisible, like oxygen in the air

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is opaque

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Solution

The correct option is A is blue in colour
Liquid oxygen is blue in colour as $O_{2}$ is paramagnetic as it has unpaired $e^{-} s$ and its magnetic asymmetry absorbs light in a portion of the visible region. Hence shows blue light.

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Similar questions

Q. In the Byju's video it said that we cannot stay submerged in water for a long time because we need oxygen to breathe. But there is oxygen in water also, so why can't we breathe when in water?

Q. Which of the following is not a component of air that we normally breathe in -
(A)Oxygen
(B) Water vapour
(C)Carbon-dioxide
(C) Nitrogen

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Question 17
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

(a) It moves along with oxygen into the cells
(b) It comes out with the $C O_{2}$ during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells so it is not at all absorbed.

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We cannot see the oxygen that we breathe. It is freely available in the air, from which it is obtained for industrial purposes by liquifying it. Liquid oxygen:

The correct option is A is blue in colourLiquid oxygen is blue in colour as O2 is paramagnetic as it has unpaired e−s and its magnetic asymmetry absorbs light in a portion of the visible region. Hence shows blue light.

The correct option is A is blue in colour
Liquid oxygen is blue in colour as $O_{2}$ is paramagnetic as it has unpaired $e^{-} s$ and its magnetic asymmetry absorbs light in a portion of the visible region. Hence shows blue light.