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The complex [Fe(H(2)O)(5)NO]^(2+) is for...

The complex `[Fe(H_(2)O)_(5)NO]^(2+)` is formed in the brown ring test for nitrates when freshly prepared `FeSO_4` solution is added to aqueous solution of `NO_3^(-)` followed by addition of conc.`H_(2)SO_(4)` . Select the correct statement about this complex.

A

Colour change is due to charge transfer.

B

It has iron in +1 oxidate state and nitrosyl as `NO^(+)`

C

It has magnetic moment of 3.87 BM confirming three unpaired electrons in Fe

D

All the above are correct statements.

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
(a,b,c) in the complex `[Fe(H_(2)O)_(5)NO]^(2-)]`
Fe is `+1` oxidation state.
NO exists as `NO^(+)`
There is a transfer of electron (charge transfer)
`Fe^(2+) + e^(-) to Fe^(+)`
`NO to NO^(+) + e^(-)`
It is responsible for colour change.

Magnetic moment `(mu)` = `sqrt(n(n+2))`
`=sqrt(3(3+2))=sqrt(15)`
3.87 BM
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