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The magnitude of crystal field stabilisa...

The magnitude of crystal field stabilisation energy in octaheral field depends on:
(I) the nature of the ligand
(II) the charge on the metal ion.
(III) whether the metal is in the first, second or third row of the transition elements

A

I, II, III only correct

B

I, II only correct

C

II, III only correct

D

III only correct

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A
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The values of the crystal field stabilization energies for a high spin d^6 metal ion in octahedral and tetrahedral fields, respectively, are :

The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is :

s-1: [MnCl_(6)]^(3),[FeF_(6)]^(3-) and [CoF_(6)]^(-3) are paramagnetic having four, five and four unpaired electrons respectively. S-2: Valence bond theory gives a quantitative interpreation of the thermodynamic stabilities of coordination compounds. S-3: The crystal field splitting Delta_(o) depends upon the field produced by the ligand and charge on the metal ion. Amongst the following correct statements are :

How would you account for the following : (i) Among lanthanoids , Ln(III) compounds are predominant , However, occasionally in solutions or in solid compounds , +2 and +4 ions are also obtained . (ii) The E_(M2+//M)^(@) for copper is positive (0.34V ) . Copper is the only metal in the first series of transition elements showing this behaviour . (iii) The metallic radii of the third (5d) series of transition metals are nearly the same as those of the corresponding members of the second series .

Assign a reason for each of the following observation : (i) The transition metals are hard and have high melting and boiling points (ii) The ionisation enthalpies (first and second) in the first series of the transition elements are found to vary irregularly

Write the names and the atomic numbers (Z) of the following elements: a. The fourth alkaline earth metal b. The fifth alkali metal c. The sixth element of the first transition series d. The second inner transition elements and e. The third noble gas

The IUPAC definition of a transition element is that it is an element that has an incomplete d-subshell in either the neutral atom or its ion. Thus the group 12 elements are member of the d-block but are not transition elements. Chemically solft members of the d-block occurs as sulphide minerals and are partially oxidised to obtain the metal, the more electropositive 'hard' metals occurs as oxides and are extracted by reduction. Opposite to p-block elements, the higher oxidation states are favoured by the heavier elements of d-block Metals on the right of the d-block tend to exist in low oxidation states and form complexes with the ligands. Square-planar complexes are common for the platinum metals and gold in oxidation states that yield d^8 electronic configuration, which include RH(I),Ir(I),Pd(II),Pt(II) and Au(III). The most distinctive features/properties of transition metal complex is their wide range of colours.The crystal field theory attributes the colour of the coordination compounds to d-d transition of the electron.It is important to note that (a) in absence of ligand, crystal field spilling does not occur and hence the substances is colourless, (b) the type of ligand also influences the colour of the complexes. Which of the following has dsp^2 hybridisation and is diamagnetic in nature ? (i) Na_4[Cr(CO)_4] , (ii) [Ni(DMGH)_2] , (iii) [PtHBr(PEt_3)_2] (iv) [As(SCN)_4]^(3-) , (v) [AuBr_4]^(-)

(a) Describe the general trends in the following properties of the first series of the transition elements: (i) Stability of +2 oxidation state (ii) Formation of oxometal ions (b) Assign reason for each of the following: (i) Transition elements exhibit variable oxidation states. (ii)Transition metal ions are usually coloured

According to C.F.T, attraction between the central metal ion and ligands in a complex is purely electrostatic. The transition metal which forms the central atom cation in the complex is regarded as a positive ion. It is surrounded by negative ligands or neutral molecules which have a lone apir of electrons, if the ligand is a neutral molecule such as NH_(3) , the negative and of the dipole in the molecule is directed towards the metal cation. the electrons on the central metal ion are under repulsive forces from those on the ligands. thus the electrons occupy the d-orbitals remain away from the direction of approach ligands. ltBrgt Q. The crystal field-spliting order for Cr^(3+) cation is octahedral field for ligands CH_(3)COO^(-),NH_(3),H_(2)O,CN^(-) is:

According to C.F.T, attraction between the central metal ion and ligands in a complex is purely electrostatic. The transition metal which forms the central atom cation in the complex is regarded as a positive ion. It is surrounded by negative ligands or neutral molecules which have a lone apir of electrons, if the ligand is a neutral molecule such as NH_(3) , the negative and of the dipole in the molecule is directed towards the metal cation. the electrons on the central metal ion are under repulsive forces from those on the ligands. thus the electrons occupy the d-orbitals remain away from the direction of approach ligands. Q. The crystal field-spliting order for Cr^(3+) cation is octahedral field for ligands CH_(3)COO^(-),NH_(3),H_(2)O,CN^(-) is:

VK JAISWAL ENGLISH-CO-ORDINATION COMPOUNDS-LEVEL 2
  1. The magnitude of crystal field stabilisation energy in octaheral field...

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  2. Which of the following ligand does not as pi-acid ligand?

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  3. If EAN of central metal cation M^(2+) in an non-chelating complex is 3...

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  4. [Mn(CO)(4)NO] is diamagnetic because:

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  5. Choose the correct option regarding the following complex compound whi...

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  6. If CO ligands are substituted by NO in respective neutral carbonyl com...

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  7. Which of the following species can act as reducing agent ?

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  8. If Delta(0) lt P, the correct electronic configuration for d^(4) syste...

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  9. Which of the following statement is not correct?

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  10. Give the correct of initials T or F for following statements. Use T if...

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  11. match List-I with list-II and select the correct answer using the code...

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  12. The value of 'spin only' magnetic moment for one of the following conf...

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  13. The correct order of magnetic moments (spin values in B.M.) among is:

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  14. Which of the following statements is incorrect?

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  15. Set of d-orbitals which is used by central metal during formation of M...

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  16. FeSO(4) is a very good absorber for NO, the new compound formed by thi...

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  17. A [M(H(2)O)(6)]^(2+) complex typically absorbs at around 600 n. it is ...

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  18. Given that the energy of the photons of different colours decreases in...

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  19. The CFSE for octahedral [CoCl(6)]^(4-) is 18,000 cm^(-1) . The CFSE fo...

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  20. MnO(4)^(-) is of intense pink colour, though Mn is in(+7) oxidation st...

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  21. In which of the following complex ion the value of magnetic moment (sp...

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