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Pure oxygen is colourless gas but liquid and solid `O_(2)` is pale blue or blue coloured, this is becauseA. Due to electronic transition triplet to singlet formation is not favourable in gaseous stateB. Density of gas is less than density of liquidC. Singlet state is diamagneticD. `O_(2)` cannot absorb photon in gaseous state. |
Answer» Correct Answer - A | |