Which Of The Following Reagents Can Be Used To Distinguish Fe3+ and Fe2+in Aqueous Solution

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Question

Which of the following reagents can be used to distinguish Fe3+ and Fe2+in aqueous solution

Solution

Correct option is

K3[Fe(CN)6] and KSCN

 

Fe3+ 3KSCN → Fe(SCN)3   (red coloured) 

3Fe2+ 2K3[Fe(CN)6] → Fe3[Fe(CN)6]2

  (blue coloured)

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