Question

30. The intermediate [Fe(SCN)(H20)5]2+ is detected in the reaction of [Co(NCS) (NH3)5]2+ with Fe(H20)6]2+ in aqueous medium t

Correct Answer is C but I need detailed explanation

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Answer #1

Yes, the correct answer is C. The reaction follows the inner-sphere mechanism.

As Fe complex contains a bridging ligand as -SCN.

Here is the reaction steps:

[Fe(II)(H2O)6]+2 +[Co(III)(NCS)(NH3)5]+2 -----> [(NH3)5Co......NCS.....Fe(H2O)5] + H2O------> [FeSCN(H2O)5]3+ + [Co(NH3)5]2+----->    [Fe(H2O)6]3+ + [Co(H2O)6]2+(hydrolysis)

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