The reaction of K3[Fe(CN)6] eith freshly...

The reaction of `K_3[Fe(CN)_6]` eith freshly prepared `FeSO_4` solution procues a dark blue precipitate caleed Turnbull's blue. Reaction of `K_4[Fe(CN)_6]` with the `FeSO_4` solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the `FeSO_4` solution with `NaNO_3`, followed by a slow addition of concentrated `H_2SO_4` through the side of the test tube produces a brown ring.
Precipitate X is

`Fe_4[Fe(CN)_6]_3`

`Fe[Fe(CN)_6]`

`K_2Fe[Fe(CN)_6]`

`KFe[Fe(CN)_6]`

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The reaction of K_3[Fe(CN)_6] eith freshly prepared FeSO_4 solution procues a dark blue precipitate caleed Turnbull's blue. Reaction of K_4[Fe(CN)_6] with the FeSO_4 solution in complete absence of air produces a white precipitate X, which turns blue in air. Mixing the FeSO_4 solution with NaNO_3 , followed by a slow addition of concentrated H_2SO_4 through the side of the test tube produces a brown ring. Among the following, the brown ring is due to the formation of

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