1. metal to ligand charge transfer transition
2. ligand to metal charge transfer transition
3. spin allowed and Laporte forbidden d-d transition
4. spin allowed and Laporte allowed d-d transition
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The blue color of [CoCl4]2- is due to its absorption of light in the visible region, particularly in the red end of the spectrum. As a result, the transmitted light appears blue to our eyes. This color is a result of the electronic transitions in the complex caused by the splitting of the d-orbitals in the presence of the chloride ligands.
because of spin allowed d-d laporte allowed transition
Cobalt nitrate typically appears as a reddish-violet to pink solid when hydrated and as a cobalt blue solid when anhydrous.
It is Red in Strong Acid like pH 1 or 2 and then it's Yellow
Bromothymol blue and phenolphthalein are two indicators that turn yellow in the presence of hydrochloric acid.
If you mix equal parts of the primary colors Yellow and Blue, you will get the secondary color Green. If you mix 2 parts Yellow and 1 part Blue, you will get the tertiary color Yellow-green. If you mix 2 parts Blue and 1 part Yellow, you will get the tertiary color Blue-green.