why o2 is colorless in gaseous orm while it is pale blue in liquid and blue in solid state?
Dear Student,
O2 is paramagnetic in nature due to which it imparts colour. However, the gas is colourless as the transition of electron in this case emits or absorbs energy in the ultraviolet region rather than visible region. Hence, oxygen gas appears to be colourless.
In solid and liquid state, the electrons are much tightly bound as compared to in gas, hence in this case when electronic transition takes place, then energy is emmited or absorbed in the visible region and hence appears blue.
O2 is paramagnetic in nature due to which it imparts colour. However, the gas is colourless as the transition of electron in this case emits or absorbs energy in the ultraviolet region rather than visible region. Hence, oxygen gas appears to be colourless.
In solid and liquid state, the electrons are much tightly bound as compared to in gas, hence in this case when electronic transition takes place, then energy is emmited or absorbed in the visible region and hence appears blue.