Which one of following..|Coordination Compounds|JEEMAIN 2021

JEE MAIN 2021

26-08-21 S1

Question

Which one of the following complexes is violet in colour?

Select the correct option:

$\left[\mathrm{Fe}(\mathrm{CN})_8\right]^{4-}$

$\left[\mathrm{Fe}(\mathrm{SCN})_6\right]^{4-}$

$\mathrm{Fe} 4\left[\mathrm{Fe}\left(\mathrm{CN}_6\right)\right]_3-\mathrm{H}_2 \mathrm{C}$

$\left[\mathrm{Fe}(\mathrm{CN})_5 \mathrm{NOS}\right]^{4-}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

(1) [Fe(CN)₆]⁴⁻ → Pale yellow solution (2) [Fe(SCN)₆]³⁻ → Blood red colour (3) [Fe₄[Fe(CN)₆]₃·H₂O → Prussian blue (4) [Fe(CN)₅NOS]⁴⁻ → Violet colour

Question Tags

JEE Main

Chemistry

Medium

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