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Question

Intense blue colour of Prussian blue arises as a result of :

A
Electron transfer between Fe(II) and Fe(I)
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B
Electron transfer between Fe(II) and Fe(III)
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C
dd transition of electron
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D
Ligand metal charge transfer
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Solution

The correct option is B Electron transfer between Fe(II) and Fe(III)
Option (B) is correct. Intense blue colour of Prussian Blue KFeIII[FeII(CN)6] arises as a result of electron transfer between Fe(II) and Fe(III).

It absorbs certain wavelengths of visible light resulting from intervalence charge transfer and these transfers are often fully allowed, they give rise to intense colour. In this case, orange-red light is absorbed, and the reflected light appears blue.

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