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Coordination Compounds

116 Questions Start NEET Test
All Exams NEET AIIMS
2016 Q51 NEET MCQ
10 Mar 2026
The correct increasing order of trans-effect of the following species is
A.
NH3 > CN$-$ > Br$-$ > C6H5$-$
B.
CN$-$ > C6H5$-$ > Br$-$ > NH3
C.
Br$-$ > CN$-$ > NH3 > C6H5$-$
D.
CN$-$ > Br$-$ > C6H5$-$ > NH3
2016 Q52 NEET MCQ
10 Mar 2026
Which of the following has longest C$-$O bond length? (Free C$-$O bond length in CO is 1.128 $\mathop A\limits^o $.)
A.
[Fe(CO)4]2$-$
B.
[Mn(CO)6]+
C.
Ni(CO)4
D.
[Co(CO)4]$-$
2015 Q53 NEET MCQ
10 Mar 2026
Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine)
A.
1
B.
3
C.
4
D.
2
2015 Q54 NEET MCQ
10 Mar 2026
The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is
A.
6
B.
7
C.
8
D.
9
2015 Q55 NEET MCQ
10 Mar 2026
The name of complex ion, [Fe(CN)6]3$-$ is
A.
hexacyanitoferrate (III) ion
B.
tricyanoferrate (III) ion
C.
hexacyanidoferrate (III) ion
D.
hexacyanoiron (III) ion.
2015 Q56 NEET MCQ
10 Mar 2026
The hybridization involved in complex [Ni(CN)4]$2-$ is (At. No. Ni = 28)
A.
sp3
B.
d2sp2
C.
d2sp3
D.
dsp2
2015 Q57 NEET MCQ
10 Mar 2026
Which of these statements about [Co(CN)6]3$-$ is true?
A.
[Co(CN)6]3$-$ has four unpaired electrons and will be in a high-spin configuration.
B.
[Co(CN)6]3$-$ has no unpaired electrons and will be in a high-spin configuration.
C.
[Co(CN)6]3$-$ has no unpaired electrons and will be in a low-spin configuration.
D.
[Co(CN)6]3$-$ has four unpaired electrons and will be in a low-spin configuration.
2015 Q58 NEET MCQ
10 Mar 2026
Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25oC?
A.
CoCl3 $ \cdot $ 5NH3
B.
CoCl3 $ \cdot $ 6NH3
C.
CoCl3 $ \cdot $ 3NH3
D.
CoCl3 $ \cdot $ 4NH3
2014 Q59 NEET MCQ
10 Mar 2026
Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is
A.
[Mn(H2O)6]3+
B.
[Fe(H2O)6]3+
C.
[Co(H2O)6]2+
D.
[Co(H2O)6]3+
2014 Q60 NEET MCQ
10 Mar 2026
Which of the following complexes is used to be as an anticancer agent?
A.
mer-[Co(NH3)3Cl3]
B.
cis-PtCl2(NH3)2]
C.
cis-K2[PtCl2Br2
D.
Na2CoCl4
2013 Q61 NEET MCQ
10 Mar 2026
The anion of acetylacetone (acac) forms Co (acac)3 chelate with Co3+. The rings of the chelate are
A.
five membered
B.
four membered
C.
six membered
D.
three membered.
2013 Q62 NEET MCQ
10 Mar 2026
Which is diamagnetic?
A.
[Co(F)6]3$-$
B.
[Ni(CN)4]2$-$
C.
[NiCl4]2$-$
D.
[Fe(CN)6]3$-$
2013 Q63 NEET MCQ
10 Mar 2026
Nitrogen detection in an organic compound is carried out by Lassaigne's test. The blue colour formed corresponds to which of the following formulae?
A.
Fe3[Fe(CN)6]2
B.
Fe4[Fe(CN)6]3
C.
Fe4[Fe(CN)6]2
D.
Fe3[Fe(CN)6]3
2013 Q64 NEET MCQ
10 Mar 2026
Crystal field splitting energy for high spin d4 octahedral complex is
A.
$-$ 1.2 $\Delta $o
B.
$-$ 0.6 $\Delta $0
C.
$-$ 0.8 $\Delta $o
D.
$-$ 1.6 $\Delta $o
2013 Q65 NEET MCQ
10 Mar 2026
The correct IUPAC name for [CrF2(en)2]Cl is
A.
chloro difluorido ethylene diaminechromium (III) chloride
B.
difluoridobis (ethylene diamine) chromium (III) chloride
C.
difluorobis-(ethylene diamine) chromium (III) chloride
D.
chloro difluoridobis (ethylene diamine) chromium (III)
2013 Q66 NEET MCQ
10 Mar 2026
Which among the following is a paramagnetic complex?
A.
[Co(NH3)6]3+
B.
[Pt(en)Cl2]
C.
[CoBr4]$2-$
D.
Mo(CO)6
2013 Q67 NEET MCQ
10 Mar 2026
In a particular isomer of [Co(NH3)4Cl2]o, the Cl$-$Co$-$Cl angle is 90o, this isomer is known as
A.
optical isomer
B.
cis-isomer
C.
position isomer
D.
linkage isomer.
2013 Q68 NEET MCQ
10 Mar 2026
A magnetic moment at 1.73 BM will be shown by one among of the following
A.
TiCl4
B.
[CoCl6]4$-$
C.
[Cu(NH3)4]2+
D.
[Ni(CN)4]2$-$
2013 Q69 NEET MCQ
10 Mar 2026
An excess of AgNO3 is added to 100 mL of a 0.01 M solution of dichlorotetraaquachromium (III) chloride. The number of moles of AgCl precipitated would be
A.
0.003
B.
0.01
C.
0.001
D.
0.002
2012 Q70 NEET MCQ
10 Mar 2026
Low spin complex of d6-cation in an octahedral field will have the following energy
A.
${{ - 12} \over 5}{\Delta _o} + P$
B.
${{ - 12} \over 5}{\Delta _o} + 3P$
C.
${{ - 2} \over 5}{\Delta _o} + 2P$
D.
${{ - 2} \over 5}{\Delta _o} + P$
2012 Q71 NEET MCQ
10 Mar 2026
Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true?
AIPMT 2012 Mains Chemistry - Coordination Compounds Question 40 English
A.
Red complex has a square planar geometry.
B.
Complex has symmetrical H-bonding.
C.
Red complex has a tetrahedral geometry.
D.
Dimethylglyoxime functions as bidenate ligand.
2012 Q72 NEET MCQ
10 Mar 2026
Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?
A.
[Ni(NH3)6]2+
B.
[Zn(NH3)6]2+
C.
[Cr(NH3)6]3+
D.
[Co(NH3)6]3+
2011 Q73 NEET MCQ
10 Mar 2026
Which of the following complex compounds will exhibit highest paramagnetic behaviour?
(At. No. Ti = 22, Cr = 24, Co = 27, Zn = 30)
A.
[Cr (NH3)6] 3+
B.
[Co (NH3)6]3+
C.
[Zn (NH3)6]2+
D.
[Ti(NH3)6] 3+
2011 Q74 NEET MCQ
10 Mar 2026
Which of the following carbonyls will have the strongest C–O bond ?
A.
Cr (CO)6
B.
Fe (CO)5
C.
Mn (CO)6+
D.
V(CO)6-
2011 Q75 NEET MCQ
10 Mar 2026
The complex, [Pt(Py)(NH3)BrCl] will have how many geometrical isomers ?
A.
3
B.
4
C.
0
D.
2
2011 Q76 NEET MCQ
10 Mar 2026
Of the following complex ions, which is diamagnetic in nature?
A.
[NiCl4]2$-$
B.
[Ni(CN)4]2$-$
C.
[CuCl4]2$-$
D.
[CoF6]3$-$
2011 Q77 NEET MCQ
10 Mar 2026
The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
(At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)
A.
[Mn(H2O)6]2+
B.
[Fe(H2O)6]2+
C.
[Co(H2O)6]2+
D.
[Cr(H2O)6]2+
2011 Q78 NEET MCQ
10 Mar 2026
Which of the following carbonyls will have the strongest C $-$ O bond?
A.
Mn(CO)6+
B.
Cr(CO)6
C.
V(CO)6$-$
D.
Fe(CO)5
2011 Q79 NEET MCQ
10 Mar 2026
The complexes [Co(NH3)6] [Cr(CN)6] and [Cr(NH3)6] [Co(CN)6] are the examples of which type of isomerism?
A.
Linkage isomerism
B.
Ionization isomerism
C.
Coordination isomerism
D.
Geometrical isomerism
2011 Q80 NEET MCQ
10 Mar 2026
Which of the following complex compounds will exhibit highest paramagnetic behaviour?
A.
[Ti(NH3)6]3+
B.
[Cr(NH3)6]3+
C.
[Co(NH3)6]3+
D.
[Zn(NH3)6]2+
2010 Q81 NEET MCQ
10 Mar 2026
Which of the following complex ions is not expected to absorb visible light?
A.
[Ni(CN)4]2$-$
B.
[Cr(NH3)6]3+
C.
[Fe(H2O)6]2+
D.
[Ni(H2O)6]2+
2010 Q82 NEET MCQ
10 Mar 2026
Crystal field stabilization energy for high spin d4 octahedral complex is
A.
$-$ 1.8 $\Delta $0
B.
$-$ 1.6 $\Delta $0 + P
C.
$-$ 1.2 $\Delta $0
D.
$-$ 0.6 $\Delta $0
2010 Q83 NEET MCQ
10 Mar 2026
The existance of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to
A.
linkage isomerism
B.
geometrical isomerism
C.
coordination isomerism
D.
ionization isomerism.
2010 Q84 NEET MCQ
10 Mar 2026
Which one of the following complexes is not expected to exhibit isomerism?
A.
[Ni(NH3)4(H2O)2]2+
B.
[Pt(NH3)2Cl2]
C.
[Ni(NH3)2Cl2]
D.
[Ni(en)3]2+
2009 Q85 NEET MCQ
10 Mar 2026
Out of TiF62$-$, CoF63$-$, Cu2Cl2 and NiCl42$-$ (Z of Ti = 22, Co = 27, Cu = 29, Ni = 28) the colourless species are
A.
Cu2Cl2 and NiCl42$-$
B.
TiF62$-$ and Cu2Cl2
C.
CoF63$-$ and NiCl42$-$
D.
TiF62$-$ and CoF63$-$
2009 Q86 NEET MCQ
10 Mar 2026
Which of the following does not show optical isomerism?

(en = ethylenediamine)
A.
[Co(NH3)3Cl3]0
B.
[Co(en)Cl2(NH3)2]+
C.
[Co(en)3]3+
D.
[Co(en)2Cl2]+
2009 Q87 NEET MCQ
10 Mar 2026
Which of the following complex ions is expected to absorb visible light?
(At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)
A.
[Ti(en)2(NH3)2]4+
B.
[Cr(NH3)6]3+
C.
[Zn(NH3)6]2+
D.
[Sc(H2O)3(NH3)3]3+
2008 Q88 NEET MCQ
10 Mar 2026
Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities.
(At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)
A.
[Co(ox)2(OH)2]$-$
B.
[Ti(NH3)6]3+
C.
[V(gly)2(OH)2(NH3)2]+
D.
[Fe(en)(bpy)(NH3)2]2+
2008 Q89 NEET MCQ
10 Mar 2026
In which of the following coordination entities the magnitude of $\Delta $o (CFSE in octahedral field) will be maximum?
(At. No. Co = 27)
A.
[Co(CN)6]3$-$
B.
[Co(C2O4)3]3$-$
C.
[Co(H2O)6]3+
D.
[Co(NH3)6]3+
2007 Q90 NEET MCQ
10 Mar 2026
The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour?

(At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)
A.
[Fe(H2O)6]2+
B.
[Ni(H2O)6]2+
C.
[Cr(H2O)6]2+
D.
[Mn(H2O)6]2+
2007 Q91 NEET MCQ
10 Mar 2026
Which of the following will give a pair of enantiomorphs?
(en = NH2CH2CH2NH2)
A.
[Cr(NH3)6][Co(CN)6]
B.
[Co(en)2Cl2]Cl
C.
[Pt(NH3)4][PtCl6]
D.
[Co(NH3)4Cl2]NO2
2006 Q92 NEET MCQ
10 Mar 2026
[Co(NH3)4(NO2)2]Cl exhibits
A.
linkage isomerism, geometrical isomerism and optical isomerism
B.
linkage isomerism, ionization isomerism and optical isomerism
C.
linkage isomerism, ionization isomerism and geometrical isomerism
D.
ionization isomerism, geometrical isomerism and oprical isomerism.
2006 Q93 NEET MCQ
10 Mar 2026
[Cr(H2O)6]Cl3 (At. no. of Cr = 24) has a magnetic momen of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is
A.
$3d_{x\,y}^1,\,3d_{y\,z}^1,\,3d_{z^2}^{1}$
B.
$3d_{\left( {x^2 - y^2} \right)}^1,\,3d_{z^2}^1,\,3d_{xz}^1$
C.
$3d_{x\,y}^1,\,\,3d_{\left( {x^2 - y^2} \right)}^1,\,3d_{y\,z}^1$
D.
$3d_{x\,y}^1,\,3d_{y\,z}^1,\,3d_{x\,z}^1$
2005 Q94 NEET MCQ
10 Mar 2026
Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)
A.
cis-[Pt(NH3)2Cl2]
B.
trans-[Pt(NH3)2Cl2]
C.
cis-[Co(en)2Cl2]+
D.
trans-[Co(en)2Cl2]+
2005 Q95 NEET MCQ
10 Mar 2026
Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?
A.
[Zn(NH3)6]2+
B.
[Cr(NH3)6]3+
C.
[Co(NH3)6]3+
D.
[Ni(NH3)6]2+
2004 Q96 NEET MCQ
10 Mar 2026
Among [Ni(CO)4], [Ni(CN)4]2$-$, [NiCl4]2$-$ species, the hybridisation states at the Ni atom are, respectively
[Atomic number of Ni = 28]
A.
sp3, dsp2, dsp2
B.
sp3, dsp2, sp3
C.
sp3, sp3, dsp2
D.
dsp2, sp3, sp3
2004 Q97 NEET MCQ
10 Mar 2026
Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be (atomic number of Mn = 25)
A.
three
B.
five
C.
two
D.
four
2004 Q98 NEET MCQ
10 Mar 2026
Which of the following does not have a metal carbon bond?
A.
Al(OC2H5)3
B.
C2H5MgBr
C.
K[Pt (C2H4)Cl3]
D.
Ni(CO)4
2004 Q99 NEET MCQ
10 Mar 2026
Which of the following is considered to be an anticancer species?
A.
AIPMT 2004 Chemistry - Coordination Compounds Question 39 English Option 1
B.
AIPMT 2004 Chemistry - Coordination Compounds Question 39 English Option 2
C.
AIPMT 2004 Chemistry - Coordination Compounds Question 39 English Option 3
D.
AIPMT 2004 Chemistry - Coordination Compounds Question 39 English Option 4
2004 Q100 NEET MCQ
10 Mar 2026
Which of the following coordination compounds would exhibit optical isomerism?
A.
Pentaamminenitrocobalt (III) iodide
B.
Diamminedichloroplatinum (II)
C.
trans-Dicyanobis (ethyleneddiamine) chromium (III) chloride
D.
tris-(Ethylenediamine) cobalt (III) bromide.