In which of the following coordination entities the magnitude of 0(CFSE in octahedral field)will be maximum?
(a) [Co(H2O)6]3+
(b) [Co(NH3)6]3+
(c) [Co(CN)6]3-
(d) [Co(C2O4)3]3-
(c) As in all the given complex the central metal atom is same and contains same number of d electrons, thus CFSE is decided by ligands. In case of strong field ligand, CFSE is maximum. CN- is a strong filed ligand,Hencem in [Co(CN)6]3- CFSE is maximum.The magnitude of oct will be maxmimum in [Co(CN)6]3-
Difficulty Level:
Fe2(CO)9 is diamagnetic.Which of the following reasons is correct?
(a) Presence of one CO as bridge group
(b) Presence of monodentate ligand
(c) Metal-metal(Fe-Fe) bond in molecule
(d) Resonance hybridization of CO
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(C) Metal-metal(Fe-Fe) bond pair up the unpaired electrons
Difficulty Level:
From the stability constant (hypothetical values)given below, predict which is the strongest ligand?
(a) Cu2++4NH3[Cu(NH3)4]2+;(k=4.5x1011)
(b) Cu2++4CN[Cu(CN)4]2-;(K=2.0x1027)
(c) Cu2++2en[Cu(en)2]2+;(K=3.0x1015)
(d) Cu2++4H2O[Cu(H2O)4]2+;(K=9.5x108)
(b) Higher is the stability constant of ligand, lesser is its dissociation,more is its stability
Difficulty Level:
(a) The EAN for Cu in [Cu(NH3)4]2+ is 35 and not 36, the next inert gas at. no.
Difficulty Level:
The coordination number and oxidation state of Cr in K3[Cr(C2O4)3] are respectively
(a) 3 and +3
(b) 3 and 0
(c) 6 and +3
(d) 4 and +2
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(c) Coordination number of Cr is 6(oxalte is bidentate ligand)and oxidation state of Cr in
K3[Cr(C2O4)3]
3(1)+x+3(-2)=0
3+x+(-6)=0
x=6-3
x=+3
Difficulty Level:
Which one of the following octahedral complexes will not show geometrical isomerism?(A and B are monodentate ligands)
(a) [MA4B2]
(b) [MA5B]
(c) [MA2B4]
(d) [MA3B3]
(b) [MA5B] due to absence of symmetry of B cannot exist in the form of cis-trans-isomer.
Difficulty Level:
According to IUPAC nomenclature sodium nitroprusside is named as
(a) sodium pentacyanonitrosyl ferrate(II)
(b) sodium pentacyanonitrosyl ferrate(III)
(c) sodium nitroferricyanide
(d) sodium nitroferrocyanide
(b) IUPAC name of sodium nitroprusside Na2[Fe(CN)5NO] is sodium pentacyanoni trosyl ferrate(III) beacuse in it NO is neutral ligand and the oxidation number of Fe is +3. Which is calculated as
Na2[Fe(CN)5NO]
2x(+1)+X+5x(-1)+1x0=0
2+X-5=0
X-3=0
X=+3
Difficulty Level:
Amoung the following which is not the -bonded organomettalic compound?
(a) K[PtCl3(-C2H4)]
(b) Fe(-C2H5)2
(c) Cr(-C6H6)2
(d) (CH3)4Sn
(d) In (CH3)4 Sn(organometallic compounds of tin) single bonds are present in form of sigma bond. pi-binded organometallic compound includes organometallic compound includes organometallic compounds of alkenes,alkynes and some other carbon containing compounds having pi-electrons in their molecular orbitals.
Difficulty Level:
IUPAC name of [Pt(NH3)3 (Br)(NO2)Cl]Cl is
(a) triamminebromochloronitroplatinum(IV)Chloride
(b) triamminebromonitrocholoroplatinum(IV)Chloride
(c) triamminechlorobromonitroplatinum(IV)Chloride
(d)triamminenitrochlorobromoplatinum(IV)Chloride
(a) The IUPAC name of [Pt(NH3)3 (Br)(NO2)Cl]Cl is triamminebromochloronitroplatinum(IV)Chloride
(Oxidation number of Pt=+4, and ligands are arranged in alphabetical order)
Difficulty Level:
The equation which is balanced and represents the correct product(s) is:
(a) Li2O +2KCl2LiCl+K2O
(b) [CoCl(NH3)5]++5H+Co2++5NH4++Cl-
(c) [Mg(H2O)6]2+ +(EDTA)4-[Mg(EDTA)]2++6H2O
(d) CuSO4+4KCNK2[Cu(CN)4+K2SO4
(b) In a,c,d changes are wrongly reported:
(a) 2LiCl+K2OLi2O+2KCl
(c) [Mg(H2O)6]2++EDTA4-[Mg(EDTA)2-+6H2O
(d) [CoCl(NH3)5]++5H+Co2++5NH4++Cl-
Difficulty Level: