For which of the following dn configuration of octahedral complexes, can not exist in both high spin and slow spin forms:

(I) d3                  (II) d5               (III) d6             (IV) d8

(1) I,II and III                                 

(2) II,III & IV

(3) I & IV                                         

(4) None of these

Subtopic:  VBT, CFT & their Limitations |
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Consider the complex [Co(NH3)4CO3]ClO4 , in which coordination number, oxidation number and number of d-electrons on the metal are respectively.

(1) 6,3,6       

(2) 6,2,7     

(3) 5,3,6     

(4) 5,3,7

Subtopic:  Ligands |
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The π-ligand which uses its d-orbital during synergic bonding in its complex compound.

(1) CN-   

(2) PR3     

(3) NO     

(4) N2

Subtopic:  Ligands |
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The IR stretchin frequencies of free CO, and CO in [V(CO)6]- , [Cr(CO)6] and [Mn(CO)6]+ are 2143 cm-1, 1860 cm-1,2000 cm-1 and 2090 cm-1, respectively. Then correct statement about metal carbonyls is :

(1) 'C-O' bond is strongest in the cation and weakest in the anion.

(2) 'C-O' bond is weakest in the cation and strongest in the anion.

(3) 'C-O' bond is longer in the cation than in the anion.

(4) 'M-C' pi bonding is higher in the cation.

Subtopic:  VBT, CFT & their Limitations |
 64%
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The π-acid ligand which uses its d-orbital during synergic bonding in its complex compound:

(1) NO+     

(2) PR3   

(3) C6H6   

(4) CO

Subtopic:  VBT, CFT & their Limitations |
 74%
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Correct sequence of CO bond order in given compounds is:

(P) Fe(CO)5   (Q) CO    (R) H3BCO     (S) [Mn(CO)5]+

1. P>R>S>Q                   

2. S>P>R>Q

3. Q>S>P>R                   

4. R>Q>S> P

Subtopic:  VBT, CFT & their Limitations |
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In which of the following complex ion the value of magnetic moment (spin only) is 3

BM and outer d-orbitals is used in hybridization.

1. [Mn(CN)6]4-     

2. [Fe(NH3)6]3+     

3. [Co(CO)4]         

4. [Cu(H2O)6]2+

Subtopic:  VBT, CFT & their Limitations |
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The inner orbital complex that exhibits geometrical but not exhibit optical isomerism is -

(1) [Cr(en)3]3+                       

(2) [IrF3(H2O)2(NH3)]

(3) [NiCl2(en)2]                       

(4) [Co(CN)2(ox)2]3-

 

Subtopic:  Isomerism in Coordination Compounds |
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Match List-I and List-II and select the correct answer using the codes given below the lists:

                       List-I                                                 List-II

(A) [Ni(NH3)6]2+                                                    (1) sp3

(B) [PtCl4]2-                                                         (2) sp3d2

(C) [Ni(CO)4]                                                         (3) dsp2  

(D) [Co(ox)3]3-                                                      (4) d2sp3

         A        B         C          D                                A        B         C          D 

(a)     2        1         3          4                      (b)       2        3         1          4 

(c)      4       1          3         2                       (d)       4        3         1          2

Subtopic:  VBT, CFT & their Limitations |
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The hybridization of the complex [CrCl2(NO2)2(NH3)2]- is:

1. sp3d2                       

2. d2sp3

3. sp3d                         

4. Cannot be predicted 

Subtopic:  VBT, CFT & their Limitations |
 76%
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