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Which complex compound obeys 18-electron...

Which complex compound obeys 18-electron rule

A

`[V(CO)_5]`

B

`[Fe(NH_3)_6]^(2+)`

C

`[Ni(CO)_6]`

D

`[Mn(H_2O)_6]^(2+)`

Text Solution

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The correct Answer is:
B
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18 electron rule: Valence shell of a transition metal consists of nine valence orbitals of (n-1) d, ns and np sub-shells, which can accommodate 18 electrons. When a metal complex has 18 valence electrons, it is said to have achieved the same electronic cofiguration as the noble gas at the end of the period. The rule and its exception are similar to the application of the octet rule of main group elements. The rule is not helpful for complexes of the s-block metals, the lanthanides or actinides. Effective atomic number is the total number of electrons possesed by the central possesed by the central metal atom/ion including the electrons contributed by the ligands. It is obvious that if a central transition metal atom/ion achieves 18 electrons in its valence shell, it attains the nearest noble gas cofiguration, which is known as effective atomic numbr (EAN) rule. [Atomic number :Cr=24, Fe=26, Cu=29, Ni=28, Rh=45] Which of the following does not obey EAN rule or 18 electron rule ?

ERRORLESS-COORDINATION COMPOUNDS-NCERT BASED QUESTION (VALENCE BOND THEORY AND GEOMETRY AND MAGNETIC NATURE OF COORDINATION COMPOUNDS)
  1. In Fe(CO)(5), the Fe larr CO sigma bond results by the overlap between...

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  2. The number of unpaired electrons in Ni (CO)(4) is

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  3. Which complex compound obeys 18-electron rule

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  4. Both [Ni(CO)4] and [Ni (CN)4]^(2-) are diamagnetic The hybridisation...

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  5. Which of the following complex is an outer orbital complex?

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  6. Which one of the following is an outer orbital complex and exhibits pa...

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  7. The diamagnetic species is

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  8. The bonds in K4[Fe(CN)6] are

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

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  10. The geometry of Ni(CO)4 and Ni(PPH3)2Cl2 are

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  11. The species having tetrahedral shape is

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  12. The hybridized state of Al^(3+) in the complex ion formed when AlCl3 ...

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  13. Consider the following two complex ions : [CoF(6)]^(3-) and [Co(C(2)O(...

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  14. Choose the correct statement

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  15. In the complex [SbF(5)]^(2-), sp^(3) d hybridization is present. Geome...

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  16. in [Cu(NH(3))(4)]SO4,Cu has following hybridization

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  17. The spin-only magnetic moments of [Mn(CN)(6)]^(4-) and [MnBr(4)]^(2-) ...

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  18. For a tetrahedral complex [MCl(4)]^(2-), the spin-only magnetic moment...

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  19. The spin-only magnetic moments of [Fe(NH3)6]^(3+) and [FeF6]^(3-) in ...

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  20. The spin only magnetic of [ZCl(4)]^(2-) is 3.87 BM where Z is

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