Single Choice

Which of the following is correct about $$\underset{I}{KFe^{II}[Fe(CN)_6]}$$ and $$\underset{II}{KFe^{III}[Fe(CN)_6]}$$ complex compounds?

ABoth are blue coloured compound because colour arises due to d-d electron transition in Fe cation present outside the complex ion.
BBoth are blue coloured compound because colour arises due to transfer of electron between Fe II and Fe III cation
Correct Answer
CBoth are blue coloured compound because in complexes Fe cation shows same d-d transition band
DComplex (I) has blue colour while complex (II) has brown colour.

Solution

$$Fe(III)$$ ions give deep blue colour with potassium ferrocynide.
$$3K_4[Fe(CN)_6]+4FeCl_3 \rightarrow Fe_4[Fe(CN)_6]_3+12KCl$$

$$Fe(II)$$ ions give blue colour with potassium ferricynide.
$$FeSO_4 + K_3[Fe(CN)_6] \rightarrow KFe[Fe(CN)_6]$$

SIMILAR QUESTIONS

Coordination Compounds

Among the following, the species that is both paramagnetic and coloured is :

Coordination Compounds

What is the relationship between observed color of the complex and the wavelength of light absorbed by the complex?

Coordination Compounds

The colourless species is:

Coordination Compounds

Which of the following compound is expected to be colourless?

Coordination Compounds

Which of the following compounds is not colored yellow?

Coordination Compounds

Which of the following statements is/are correct?

Coordination Compounds

If $$MCl_2$$ salt is white, then comment on colour of its iodide salt.

Coordination Compounds

Choose incorrect statement.

Coordination Compounds

Why a solution of $$[Ni(H_2O)_6]^{2+}$$ is green while a solution of $$[Ni(CN)_4]^{2-}$$ is colourless? (At no. of $$Ni=28$$)

Coordination Compounds

Answer the following question: $$[Ni(H_2O)_6]^{2+}$$ is green whereas $$[Ni(CN)_4]^{2-}$$ is colourless. Why? (At no. of $$Ni=28$$)

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