MCQ
Turnbull's blue is:
  • $\mathrm{Fe}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$
  • B
    $\mathrm{\sim K}_4 \mathrm{Fe}(\mathrm{CN})_6$
  • C
    $\mathrm{\sim K}_3 \mathrm{Fe}(\mathrm{CN})_6$​
  • D
    $\mathrm{Na}_4 \mathrm{Fe}(\mathrm{CN})_6$

Answer

Correct option: A.
$\mathrm{Fe}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$
Turnbull's blue is $\mathrm{Fe}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]_2$.
The structure is as follows:

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