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Question

During the formation of ferric thiocyanate and potassium nitrate from ferric nitrate and potassium thiocyanate, the red color is due to the formation of


A

Fe(CNS)+2

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B

Fe(CNS)2+

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C

Fe(CNS)3

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D

Fe(CNS)2

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Solution

The correct option is B

Fe(CNS)2+


Ferric thiocyanate is formed three stages. The steps are given below:

Fe3++CNSFe(CNS)2+

Fe(CNS)2++CNSFe(CNS)+2

Fe(CNS)+2+CNSFe(CNS)3

Among these, Fe(CNS)2+ is responsible for deep red colour.


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