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

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

A

`Cu^(2+)`

B

`As^(3+)`

C

`Zn^(2+)`

D

`Fe^(3+)`

Text Solution

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The correct Answer is:
A,C,D
`(A) 2Cu^(2+)+K_(4)[Fe(CN)_(6)]rarrunderset(["chocolate brown ppt."])(Cu_(2)[Fe(CN)_(6)]+4K^(+))`
`(C ) 2Zn^(2+)+K_(4)[Fe(CN)_(6)]underset(("bluish white ppt."))(Zn_(2)[Fe(CN)_(6)]+4K^(+))`
`(D)4Fe^(3+)+3K_(4)[Fe(CN)_(6)]rarrunderset(("prussian blue"))(Fe_(4)[Fe(CN)_(6)]_(3))+12K^(+)`
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K_(4)[Fe(CN)_(6)] can be used to detect one or more out of Fe^(2+), Fe^(3+). Zn^(2+), Ag^(+), Ca^(2+) :

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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

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

NARAYNA-CHEMISTRY OF HEAVY METALS-Level-V multiple answer questions
  1. In which reaction (s) blood red coloration is observed in product?

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

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  3. CuSO(4) reacts with KCN to form

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  4. Among the following the colour less compound (s) is // are

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  5. Potassium manganate (K2MnO4) is formed when

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  6. The equilibrium 2Cu^(1) hArr Cu^(0)+Cu^(11) in aqueous medium at 2...

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  7. For the given aqueous reactions, which of the statements(s) is ( are) ...

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  8. CuSO(4).5H(2)O overset(1000^(@)C)(rarr)underset(("solide")("gas"))(A+B...

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  9. Which of the following coinage metal is // are dissolved in conc. HNO(...

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  10. When ferrous sulphate is added to mercuric chloride then

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  11. Which of the following statement is wrong regarding copper sulphate.

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  12. Copper ion forms blue coloured complex with ligand NH(3) and a colourl...

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  13. Which of the following is // are correct about Wilkinson's catalyst?

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  14. Which of the following give O(2) on strong heating ?

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  15. K(2)MnO(4) can be converted to KMnO(4) by

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  16. The diamagnetic compounds is/are

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  17. The compounds that liberate Cl(2) on heating with conc. HCl is // are

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  18. Which of the following ions will give a coloured precipitate with lead...

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  19. The metal oxide which decomposes on heating is // are :

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  20. The species that undergoes disproportionational is an alkaline medium ...

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