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Colours in Coordination Compounds

The intense b...

Question

The intense blue colour of Prussian blue salts arises from:

A

d – d transition

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B

inner valence electron transfer

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C

ligand to metal charge transfer

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D

metal to ligand charge transfer

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Solution

The correct option is B
inner valence electron transfer

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Q. Intense blue colour of Prussian blue arises as a result of :

Q. Assertion :Prussian blue is formed in the Prussian blue assay for total phenols. Reason: Prussian blue is produced by oxidation of ferrous ferrocyanide salts.

Q. Prussian blue colour is obtained by mixing together an aqueous solution of

F e^{3 +}

F e^{2 +}

does not give prussian blue colour with

K_{4} [F e (C N)_{6}]

, but on its reaction with (X) prussian blue colour appears with the reagent. (X) is :

{N H}_{2} - {N H}_{2}

gives Prussian blue colour during Lassaigne test (element detection test). Reason: NaCN gives Prussian blue colour of

{F e}_{4} {[F e ({C N}_{6})]}_{3}

F e {S o}_{4}, F e {C I}_{3}

.

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