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K(4)[Fe(CN)(6)] is not used for the dete...

`K_(4)[Fe(CN)_(6)]` is not used for the detection of

A

`Fe^(2+)` ions

B

`Zn^(2+)` ions

C

`Cu^(2+)` ions

D

`Fe^(3+)` ions

Text Solution

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The correct Answer is:
1
`Cu^(+2)+[Fe(CN)_(6)]^(4-)rarrunderset("reddish brown")(Cu_(2)[Fe(CN)_(6)]darr)`
`4Fe^(3+)+3[Fe(CN)_(6)]^(4-)rarr underset("blue")(Fe_(4)[Fe(CN)_(6)]_(3)darr)`
`Zn^(2+)+[Fe(CN)_(6)]^(4-)rarr underset("bluish white ppt")(Zn_(2)[Fe(CN)_(6)darr)`
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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

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