The separation of trivalent lanthanide ions, Lu3+ , Yb3+ , Dy3+ , Eu3+ can, be effectively done by a cation exchange resin using ammonium o-hydroxy iso-butyrate as the eluent. The order in which the ions will be separated is
A. Lu3+ , Yb3+ , Dy3+ , Eu3+
B. Eu3+ , Dy3+ , Yb3+ , Lu3+
C. Dy3+ , Yb3+ , Eu3+ , Lu3+
D. Yb3+ , Dy3+ , Lu3+ , Eu3+
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[CoCl4 ]2- is a blue coloured complex. Controlled-treatment of this complex with water generates two isomeric light pink coloured complexes of composition [Ca(H2 O)4 Cl2 ]. Identify the correct point groups far [CoCl4 ]2- and two isomeric complexes [CO(H2 O)4 Cl2 ].
A. D4h and (C2v and C2h )
B. Td and (C2v and D4h )
C. D4h and (C2v and D4h )
D. Td and (C2v and C4v )
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The complex that exists as a pair of enantiomers is
A. trans-[CO(H2 NCH2 CH2 NH2 )2 Cl2 ]+
B. cis-[Co(NH3 )4 Cl2 ]+
C. [Pt(PPh3 )(Cl)(Br)(CH3 )]-
D. [Co(H2 NCH2 CH2 NH2 )3 ]3+
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The complex formed in the brown ring test for nitrates is
A. [Fe(H2 O)5 NO]3+
B. [Fe(H2 O)5 NO]2+
C. [Fe(H2 O)4 (NO)]2+
D. [Fe(H2 O)4 (NO)]3+
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The ligand field bands of lanthanide complexes are generally sharper than those of transition metal complexes because
A. transitions are allowed for lanthanide complexes
B. intensity of the bands are higher for lanthanide complexes
C. f-orbital have higher energy than d-orbital
D. f-orbital, compared to d-orbital interact less effectively with ligand
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The total number of metal-metal bonds in Ru3 (CO)12 and Co4 (CO)12 respectively is
A. 3 and 6
B. 4 and 5
C. zero and 4
D. 3 and 4
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The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for
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The comlexes [Co(NH3 )4 (H2 O)Cl]Br2 and [Co(NH3 )Br2 ]Cl ⋅ 2 O are examples of
A. ionization isomerism
B. linkage isomerism
C. geometrical isomerism
D. optical isomerism
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The compound which obeys 18-electron rule is
A. Mn(CO)3
B. Fe(CO)4
C. V(CO)6
D. Cr(CO)6
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The correct statement regarding the thermodynamic stability and kinetic reactivity of metal ion complexes is that
A. more stable complexes are less reactive
B. there exists a dependence on the bulkiness of the ligand
C. there exists no direct relation between these two phenomenon
D. there exists a dependence on the size of the metal ion
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The correct statement about the Cu-N bond distances in [Cu(NH3 )6 ]2+ is
A. all the bond distances are equal
B. the axial bonds are longer than the equatorial ones
C. the equatorial bonds are longer than the axial ones
D. all the bond distances are unequal
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A well known naturally occurring organometallic compound is
A. vitamin B12 coenzyme
B. chlorophyll
C. cytochrome P-450
D. myoglobin
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W(CO)6 reacts with MeLi to give an intermediate which upon treatment with CH2 N2 gives a compound X, X is represented as
A. WMe6
B. (CO)5 W-Me
C. (CO)5 W=C(Me)OMe
D. (CO)5 W≡CMe
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The metal ion present in carbonic anhydrase is
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The red colour of oxyhaemoglobin is mainly due to the
A. d-d transition
B. metal to ligand charge transfer transition
C. ligand to metal charge transfer transition
D. intraligand π - π ∗
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The compound which exhibits John-Teller distortion is
A. [Mn(H2 O)6 ]2+
B. [Mn(H2 O)6 ]3+
C. [Cr(H2 O)6 ]3+
D. [Fe(CN)6 ]4-
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The number of absorption bands observed in [FeF6 ]3- and [CoF6 ]3- , respectively are
A. 1 and 3
B. 0 and 1
C. 0 and 3
D. 3 and 1
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The metal present at the active site of the protein carboxypeptidase A is
A. zinc
B. molybdenum
C. magnesium
D. cobalt
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Amongst the following, the strongest oxidizing anion is
A. CrO 4 2 −
B. VO 4 3 −
C. FeO 4 2 −
D. MnO 4 2 −
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In the transformation of oxyhaemoglobin to deoxyhaemoglobin
A. Fe2+ in the low spin state changes to Fe2+ in the high spin state
B. Fe2+ in the low spin state changes to Fe2+ in the low spin state
C. Fe2+ in the high spin state changes to Fe2+ in the low spin state
D. Fe2+ in the high spin state changes to Fe2+ in the high spin state
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