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K(4)[Fe(CN)(6)] is used to detect...

`K_(4)[Fe(CN)_(6)]` is used to detect

A

`Fe^(3+)` ion

B

`Cu^(+)` ion

C

`Cu^(3+)` ion

D

`Fe^(2+)` ion

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The correct Answer is:
A
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K_(4)[Fe(CN)_(6)] is a

K_(4)[Fe(CN)_(6)] is used for detection of

K_(4)[Fe(CN)_(6)] can be used to detect one or more out of Fe^(2+), Fe^(3+). Zn^(2+), Ag^(+), Ca^(2+) :

K_(4)[Fe(CN)_(6)] can be used to detect one or more out of Fe^(2+),Fe^(3+),Zn^(2+),Cu^(2+),Ag^(+),Ca^(2+),Th^(4+) :

Iron (+II) is one of the most important oxidation states, and salts are called ferrous salts. Most of Fe(+II) salts are pale green and contain [Fe(H_(2)O)_(6)]^(2+) ion. Fe(+II) compounds are easily oxidised by air and so are difficult to obtain pure Fe^(2+) form many complexes like K_(4)[Fe(CN)_(6)] K_(3)[Fe(CN)_(6)] is used in the detection of Fe^(2+) ion with which it gives a deep blue colour. This colour is due to the formation of

In K_(4)Fe(CN)_(6)

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