Which of the following species can act as reducing agent ?

(1) [Co(CO)4]-     

(2) Mn(CO)6       

(3) Mn(CO)5       

(4) Cr(CO)6

Subtopic:  E.A.N |
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The electronic arrangement of an octahedral complex with a d4 configuration, if 0 < pairing energy is:

1. t2g4eg0                       

2. eg4t2g0               

3. t2g3eg1           

4. eg2t2g2

Subtopic:  VBT, CFT & their Limitations |
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Which of the following statement is not correct ?

(a) Bis(glycinato)Zinc(II) is optically active

(b) [NiCl4]2- and  [PtCl4]2- have different shape

(c) [Ni(CN)4]4- is square planar complex

(d) [Ni(CN)4]2- and [Ni(CO)4] have the same magnetic moment

 

Subtopic:  VBT, CFT & their Limitations |
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Give the correct of initial or F for following statements. Use is statement is true and if it is false

(I) Co(III) is stabilised in presence of weak ligands , while Co(II) is stabilised in presence of strong field ligand.

(II) Four coordinated complexes of Pd(II) and Pt(II) are diamagnetic and square planar.

(III) [Ni(CN)4]4- ion and [Ni(CO)4] are diamagnetic tetrahedral and square planar.

(IV) Ni2+ ion does not form inner orbital octahedral complexes.

(1) TFTF                                   

(2) TTTF

(3) TTFT                                   

(4) FTFT

Subtopic:  VBT, CFT & their Limitations |
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Match List-I with List-II and select the correct answer using the codes given below :

                      List-I                                              List-II

(I) [FeF6]3-                                                   (A) 1.73 BM

(II) [Ti(H2O)6]3+                                             (B) 5.93 BM

(III) [Cr(NH3)6]3+                                            (C) 0.00 BM

(IV) [Ni(H2O)6]2+                                             (D) 2.83 BM

(V)  [Fe(CN)6]4-                                               (E) 3.88 BM

          (I)    (II)   (III)   (IV)   (V)                       (I)    (II)   (III)   (IV)   (V) 

(a)      B      A       C       D      E                  (b)    B      A       E       D      C

(c)       B     C       D       E      A                 (d)     D     E       A       B       C  

Subtopic:  VBT, CFT & their Limitations |
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Set of d-orbitals which is used by central metal during formation of MnO4-?

(1) dx2-y2 ,dz2 ,dxy                   

(2) dxy , dyz , dxz

(3) dx2-y2 , dxy , dxz                   

(4) dx2-y2 , dz2 , dxz

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FeSO4 is a very good absorber for NO, the new compound formed by this process is found to contain number of unpaired electrons:

(1) 4         

(2) 5           

(3) 3         

(4) 6

Subtopic:  VBT, CFT & their Limitations |
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A[M(H2O)6]2+ complex typically absorbs at around 600 nm. It is allowed to react with ammonia to form a new complex [M(NH3)6]2+ that should have absorption at :

(1) 800 nm         (2) 580 nm       (3) 620 nm      (4)  320 nm

Subtopic:  VBT, CFT & their Limitations |
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Which of the following order of CFSE is incorrect?

(a) [Co(en)3]3+ >[Co(NH3)6]3+>[Co(H2O)6]3+

(b) [PtCl4]2->[PdCl4]2->[NiCl4]2-

(c) [Ni(dmgH)2]<[Ni(en)2]2+

(d) [Co(ox)3]3-<[Co(en)3]3+

Subtopic:  VBT, CFT & their Limitations |
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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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