A complex with the composition [MA3B]n± is found to have no geometrical isomers. The possible structures (s) of the complex is (Where A and B are monodentate ligands)

(1) Tetrahedral                   

(2) Square planar

(3) Both (a) and (b)             

(4) Cannot be predicted

Subtopic:  VBT, CFT & their Limitations |
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Complexes formed in the following methods are:

(I) Mond's process for purification of nickel

(II) Removal of unreacted AgBr from photographic plate

(III) Removal of lead poisoning from the body

Options are as follows: 

             I                                       II                                           III
(a) Ni(CO)4                            [Ag(CN)2]-                       [Pb(EDTA)]2-
(b) Ni(CO)4                            [Ag(S2O3)2]3-                 [Pb(EDTA)]2-
(c) Ni(CO)6                            [Ag(S2O3)]3-                   [Pb(EDTA)]4-
(d) Ni(CO)6                            [Ag(S2O3)]-                    [Pb(EDTA)]4-  

Subtopic:  Introduction, Classification and Nomenclature |
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The correct name for the complex ion [CoCl(ONO)(en)2]+ is:

1. chlorobis(ethylenediamine)nitrito-O-cobaltate(III) ion

2. chlorodiethyldiaminenitrito-O-cobalt(III) ion

3. chloronitrito-O-diethyldiamine cobaltate (III) ion

4. chlorobis (ethylenediamine)nitrito-O-cobalt (III) ion

Subtopic:  Introduction, Classification and Nomenclature |
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Which of the following ligand does not as π-acid ligand?

(a) N2           (b) CO              (c) C2H4                 (d) O22-

Subtopic:  Ligands |
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[Mn(CO)4NO] is diamagnetic because:

1. Mn metal is paramagnetic in free state

2. Mn is in +1 oxidation state in this complex

3. NO is present as positive ligand

4. All of the above

 

Subtopic:  VBT, CFT & their Limitations |
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Choose the correct option regarding the following complex compound which follows (F) and does not follow (NF) the Sidgwick EAN rule:

(I) [(Ph3P)2PdCl2PdCl2]                     (II) [NiBrCl(en)]

(III) Na4[Fe(CN)5NOS]                       (IV) Cr(CO)3(NO)2

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

(a)    NF   NF      NF       NF                 (b)    F       F        NF        F

(c)     NF   NF      F          F                  (d)   NF      NF      F          NF 

 

Subtopic:  E.A.N |
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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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