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K(4)[Fe(CN)(6)] is used for detection of...

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

A

`Fe^(+)` ions

B

`Fe^(3+)` ions

C

`Zn^(2+)` ions

D

`Cu^(2+)` ions.

Text Solution

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The correct Answer is:
B, C, D
`K_(4)[Fe(CN)_(6)]` or potassium ferrocyanide gives dark bluk colouration with `Fe^(3+)` ions , with `Cu^(2+)` ions `Zn^(2+)` ions and reddish brown ppt. with `Cu^(2+)` ions.
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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)

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+) :

DINESH PUBLICATION-CO-ORDINATION COMPOUNDS -SELECTED STRAIGHT OBJECTIVE TYPE MCQS
  1. Which of the following statements about [Fe(H(2)O)(5)NO]^(2-) are corr...

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  2. Select the complexes in which iron is in +2 oxidation state ?

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  3. K(4)[Fe(CN)(6)] is used for detection of

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  4. K(3)[Fe(CN)(6)] is used for the detection of

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  5. A ligand can be

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  6. The oxidation state of Fe in brown complex [Fe(H(2)O)(5)NO]SO(4) is

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  7. Amongst Ni(CO)(4),[Ni(CN)(4)]^(2-) and [NiCl(4)]^(2-)

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  8. The compound which does not show paramagnetism is

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  9. The number of d-electrons in [Cr(H(2)O)(6)]^(3+) [At. No. of Cr = 24 ]...

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  10. Among the following ions, which one has the highest paramagnetism?

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  11. Which of the following is an organometallic compound ?

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  12. In nitroprusside ion, the iron and NO exist as Fe(II) and NO^(+) rathe...

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  13. The geometry of Ni(CO(4)) and Ni(PPh(3))(2)Cl(2) are

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  14. The pair having the same magnetic moment is [at. No. Cr = 24, Mn = ...

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  15. The correct order of hybridisation of the central atom in the followin...

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  16. A mixture x containing 0.02 mol of [Co(NH(3))(5) SO(4)]Br and 0.02 mol...

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  17. In the process of extraction of gold. Roasted gold ore +CN^(-)+H(2)O...

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  18. The pair of the compounds in which both the metals are in the highest ...

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  19. The species having tetrahedral shape is

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  20. Which kind of isomerism is shown by Co (NH(3))(4) Br(2) Cl ?

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