Question

Oxidation or reduction which is responsible of decolouration

Answer 1

• Answer:

• If we are talking about colour change after the reaction, the colour change is simply due to different compounds present in the reaction mixture. The reactants have converted to products, and since reactants and products may be of a different colour, you therefore observe a change in colour.
• This is likely due to a change in oxidation state of the metal central atom of the complex you are reacting. To explain the colour of the complex is a totally different question.
• Basically, depending on the oxidation state of the metal ion, it will have different absorptions in the UV to visible spectrum, which corresponds to the energy needed for electronic transitions. Thus, the valency of the metal ion is important, as it helps us to predict how many absorptions there are, and the wavelength of light absorbed. This can be done using an Orgel diagram and a Tanabe-Sugano diagram. The wavelength of light absorbed is then complementary to the colour observed by our naked eye.

Explanation:

Answer 2

Answer:

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