Pure oxygen is colourless gas but liquid...

Pure oxygen is colourless gas but liquid and solid `O_(2)` is pale blue or blue coloured, this is because

A

Due to electronic transition triplet to singlet formation is not favourable in gaseous state

B

Density of gas is less than density of liquid

C

Singlet state is diamagnetic

D

`O_(2)` cannot absorb photon in gaseous state.

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Verified by Experts

The correct Answer is:

A

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