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31 Year NEET Previous Year Questions: Coordination Compounds - NEET MCQ


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67 Questions MCQ Test Chemistry Class 12 - 31 Year NEET Previous Year Questions: Coordination Compounds

31 Year NEET Previous Year Questions: Coordination Compounds for NEET 2024 is part of Chemistry Class 12 preparation. The 31 Year NEET Previous Year Questions: Coordination Compounds questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Coordination Compounds MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Coordination Compounds below.
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31 Year NEET Previous Year Questions: Coordination Compounds - Question 1

 Which of the following is considered to be an anticancer species ? 

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 1

Diaminodichloroplatinum (II) commonly known as  - platin is found to have anticancer property.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 2

Which of the following coordination compounds would exhibit optical isomerism? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 2

The optical isomers are pair of molecules which are non super imposable mirror images of each other

The two optically active isomers are collectivity called enantiomers.

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31 Year NEET Previous Year Questions: Coordination Compounds - Question 3

Among [ Ni(CO)4],[ Ni(CN) 4]2- ,[ NiCl4]2- species, the hybridization states of the Ni atom are, respectively(At. No. of Ni = 28) [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 3

28 Ni0 :

Remember CO is a strong ligand

Remember CN is also a strong ligand

Cl is a weak ligand, hence no pairing of electrons takes place.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 4

CN– is a strong field ligand. This is due to the fact that [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 4

CN is astrong fieldlig and as it is a psuedohalide ion. These ions are strong coordinating ligands and hence have the tendency to form σ-bond (from the pseudo halide to the metal) and π-bond. (from the metal to pseudo halide)

31 Year NEET Previous Year Questions: Coordination Compounds - Question 5

Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be (At. no. of Mn = 25) [2004] 

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 5

Since H2O is a weak ligand, it will not cause pairing of electrons in the metal ion Mn2+.
Thus electronic configuration of the metal (Mn2+) in the complex will be

i.e s unpaired electrons.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 6

Which of the following does not have a metalcarbon bond? [2004]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 6

Triethoxyaluminium has no Al – C linkage

31 Year NEET Previous Year Questions: Coordination Compounds - Question 7

Which one of the following is an inner or bital complex as well as diamagnetic in behaviour? (Atomic number: Zn = 30, Cr = 24, Co = 27, Ni = 28) [2 00 5]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 7

31 Year NEET Previous Year Questions: Coordination Compounds - Question 8

Which one of the following is expected to exhibit optical isomerism? (en = eth ylen ediamine) [2 00 5]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 8

Transform of [M(AA)2 a2] does not shows optical isomerism.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 9

[Co(NH3)4 (NO2)2] Cl exhibits [2006]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 9

The given compound may have linkage isomerism due to presence of NO2 group which may be in the form –NO2 or –ONO.
It may have ionisation isomerism due to presence of two ionisable group –NO2 & – Cl. It may have geometrical isomerism in the form of form as follows :

Geometrical isomers

31 Year NEET Previous Year Questions: Coordination Compounds - Question 10

[Cr(H2O)6]Cl3 (at no. of Cr = 24) has a magnetic moment of 3.83 B. M. The correct distribution of 3d electrons in the Chromium of the complex is

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 10

on solving n = 3

as per magnetic moment, it has three unpaired electron.

So      3dxy' 3dyz' 3dxz'

31 Year NEET Previous Year Questions: Coordination Compounds - Question 11

Which of the following will give a pair of enantiomorphs? [2007]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 11

Non superimposable mirror images are called optical isomers and may be described as “chiral’. They are also called enantiomers and rotate plane polarised light in opposite directions.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 12

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? [2007]           (At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 12

Lesser is the number of unpaired electrons smaller will be the paramagnetic behaviour.

As Ni++ has minimum no. of unpaired e thus this is least paramagnetic.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 13

Which of the following complexes exhibits the highest paramagnetic behaviour ? [2008]       where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities) (At.nosTi = 22, V = 23, Fe = 26, Co = 27)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 13

More the number of unpaired electrons present in a complex more is its paramagnetic behaviour.
To find unpaired electrons let us calculate the oxidation states of elements in each complex and then write the electronic configuration for that oxidation state to find the number of unpaired electrons in it.
We find that in their complexes V, Fe, Co and Ti are in + 3, + 2, + 5, and + 3 oxidation states respectively. In these state the number of unpaired electrons present in them are 2, 4, 4 and 1 respectively. Since the maximum number of unpaired electrons are in cobalt complex so it has highest paramagnetic behaviour i.e. choice (c) is correct answer.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 14

In which of the following coordination entities the magnitude Δ0 (CFSE in octahedral field) will be maximum? [2008]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 14

In octahedral field the crystal field splitting of d- orbitals of a metal ion depends upon the field produced by the ligands.
In general ligands can be arranged in a series in the order of increasing fields and splittings which they produce around a central metal ion. A portion of the series is given below. cyanide > ethylene - diamine > ammonia > pyridine>thiocyanate > water> fluoride > oxalate > hydroxide> chloride> bromide > iodide.
Out of the given ligands water, ammonia, cyanide and oxalate, we can find from the above series of ligands that the maximum splitting will occur in case of cyanide (CN) i.e. the magnitude of Δ0 will be maximum in case of [Co(CN)6]3+.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 15

Which of the following does not show optical isomerism? [2009]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 15

The octahedral coordination compounds of the type MA3B3 exhibit fac-mer isomerism.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 16

Which of the following complex ions is expected to absorb visible light? [2009]             (At. no. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 16

Since Cr3+ in the complex has unpaired electrons in the d orbital, hence will be coloured

31 Year NEET Previous Year Questions: Coordination Compounds - Question 17

Which of the following complex ion is not expected to absorb visible light ? [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 17

   Number of unpaired electrons = 0

: Number of unpaired electrons = 3

: Number of unpaired electrons = 4

: Number of unpaired electrons = 2

31 Year NEET Previous Year Questions: Coordination Compounds - Question 18

Crystal field stabilization energy for high spin 4 octahedral complex is: [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 18

4 in high spin octahedral complex

CFSE = [0.6 × 1] + [–0.4 × 3] = – 0.6 Δ0

31 Year NEET Previous Year Questions: Coordination Compounds - Question 19

The existence of two different coloured complexes with the composition of [Co(NH3)4 Cl2]+ is due to : [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 19

31 Year NEET Previous Year Questions: Coordination Compounds - Question 20

Which one of the following complexes is not expected to exhibit isomerism?              [2010]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 20

hybridisation, thus tetrahedral in shape. Hence the four ligands are not different to exhibit optical isomerism.

∴      Correct choice : (d)

31 Year NEET Previous Year Questions: Coordination Compounds - Question 21

Of the following complex ions, which is diamagnetic in nature ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 21

Since, the coordination number of Ni in this complex is 4, the configuration of Ni++ at first sight shows that the complex is paramagnetic with two unpaired electron. However, experiments show that the complex is diamagnetic. This is possible when the 3d electrons rearrange against the Hund’s rule as shown below. This is in accordance with  the fact that the ligand involved here is strong i.e., CN ion.

Ni++ (after rearrangement) 

Hence, now dsp2 hybridization involving one 3d, one 4s and two 4p orbitals, takes place leading to four dsp2 hybrid orbitals, each of which accepts four electron pairs from CN ion forming [Ni (CN)4]2– ion.

Thus, the complex is diamagnetic as it has no unpaired electron.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 22

Th e complexes [Co(NH3)6] [Cr (CN)6] and [Cr(NH3)6] [Co(CN)6] are the examples of which type of isomerism? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 22

Coordination isomerism occurs when cationic and anionic complexes of different metal ions are present in a salt. Interchange of ligand between the complexes give isomers e.g. [Co (NH3)6] [Cr (CN)6]  is an isomer of [Co (CN)6] [Cr (NH3)6]

31 Year NEET Previous Year Questions: Coordination Compounds - Question 23

The complex, [Pt(Py)(NH3)BrCl] will have how many geometrical isomers ? [2011]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 23

Complexes of the type MABCD may exist in three isomeric forms.

Similarly, [Pt (Py) (NH3) BrCl] may exist in three isomeric form in which M = Pt A = Py,  B = NH3,  C = Br,  D = Cl.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 24

The d-electron configurations of Cr 2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7, respectively.Which one of the following will exhibit minimum paramagnetic behaviour? [2011]                 (At, nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 24

Minimum paramagnetic behaviour = [Co (H2O)6]2+

31 Year NEET Previous Year Questions: Coordination Compounds - Question 25

Which of the following carbonyls will have the strongest C – O bond ? [2011 M]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 25

As + ve charge on the central metal atom increases, the less readily the metal can donate electron density into the π* orbitals of CO ligand to weaken the C – O bond.
Hence, the C – O bond would be strongest in Mn(CO)6+.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 26

Which of the following complex compounds will exhibit highest paramagnetic behaviour? [2011M] (At. No. : Ti = 22, Cr = 24, Co = 27, Zn = 30)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 26

(a) [Ti(NH3)6]3+ : 3d1 configuration and thus has one unpaired electron. (b) [Cr(NH3)6]3+ : In this complex Cr is in +3 oxidation state.

Thus, the complex is paramagnetic.

(c) [Co(NH3)6]3+ : In this complex are cobalt ion is in + 3 oxidation state with 3d6 configuration.
Co3+,[Ar]3d6

(inner orbital or d2sp3 hybrid orbital low spin complex) diamagnetic

(d) In this complex Zn exists as

Zn++ ion

Zn++ ion : 3d10 4s0

Due to presence of paired electrons complex is diamagnetic in nature.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 27

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour ? [2012]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 27

[Ni(NH3)6]2+

 Ni2+ = 3d8, according to therefore, hybridisation is sp3d2 & complex is paramagnetic.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 28

Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal Ni(II). Which of the following statements is not true ? [2012 M]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 28

Nickel ions are frequently detected by the formation of red precipitate of the complex of nickel dimethylglyoxime, when heated with dimethylglyoxime.

Dimethylglyoxime

Nickel dimethylglyoxime

31 Year NEET Previous Year Questions: Coordination Compounds - Question 29

Low spin complex of d6-cation in an octahedral field will have the following energy : [2012 M]    (Δ0= Crystal Field Splitting Energy in an octahedral field, P = Electron pairing energy)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 29

C.F.S.E  =  – 0.4 × 6Δ0 + 3P

31 Year NEET Previous Year Questions: Coordination Compounds - Question 30

A magnetic moment of 1.73 BM will be shown by one among the following : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 30

[Cu(NH3)4]2+ hybridisation 2 Cu+2 – 3 9 has one unpaired e-

So magnetic moment

31 Year NEET Previous Year Questions: Coordination Compounds - Question 31

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 : [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 31

31 Year NEET Previous Year Questions: Coordination Compounds - Question 32

The correct IUPAC name for [CrF2(en)2]Cl is: [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 32

IUPAC name of [CrF2 (en)2]Cl is Difluoridobis(ethylenediamine)chromium (III) chloride.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 33

Crystal field splitting energy for high spin 4 octahedral complex is:    [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 33

CFSE = (– 0.4x + 0.6y) Δ0

where

31 Year NEET Previous Year Questions: Coordination Compounds - Question 34

Which is diamagnetic?         [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 34

CN is a strong ligand and causes pairing of 3 electrons of Ni2+.

∴           It is diamagnetic.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 35

In a particular isomer of  [Co(NH3)4Cl2]0, the Cl-Co-Cl angle is 90°, the isomer is known as     [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 35

The correct answer is Option C.
The Cl−Co−Cl bond is at right angle.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 36

The anion of acetylacetone (a cac) for ms Co(acac)3 chelate with Co3+. The rings of the chelate are [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 36

Acetylacetone forms six membered stable ring complexes.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 37

Which among the following is a paramagnetic complex? [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 37

Correct Answer :- d

Explanation : Co2+ = (3d5)

Bromine is a weak ligand but it is known that all tetrahedral complexes are high-spin regardless of the splitting power of the ligand. The low spin arrangement has five unpaired electrons in the d-orbital. So it is paramagnetic in nature.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 38

An example of double salt is [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 38

Potash alum K2SO4 .Al2 (SO4)3 24H2O is a double salt.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 39

The complex ion [Co(NH3)6]3+ is formed by sp3d2 hybridisation. Hence the ion should possess

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 39

According to VSEPR theory, a molecule with six bond pairs must be octahedral.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 40

K3[Al(C2O4)3] is called [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 40

IUPAC name is potas sium trioxalatoaluminate (III).

31 Year NEET Previous Year Questions: Coordination Compounds - Question 41

Among the following complexes, optical activity is possible in [1994]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 41

It is optically active when two Cl atoms are in cis position.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 42

Which of the following is common donor atom in ligands? [1995]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 42

In the formation of a coordinate bond, the ligands donate a pair of electrons to the metal atom. Futher nitrogen and oxygen has great tendency to donate the pair of elctrons in most of  the compounds. Therefore both nitrogen and oxygen are common donor atoms in ligands.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 43

Among the following, the compound that is both paramagnetic and coloured, is [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 43

Among the following, the compound that is both paramagnetic and coloured, is [1996]

31 Year NEET Previous Year Questions: Coordination Compounds - Question 44

Which of the following may be considered to be an organometallic compound? [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 44

Organometallic compounds are the ones having a direct bond between a metal and carbon atoms. So, nickel carbonyl is one such compound.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 45

The number of geometrical isomers for [Pt (NH3)2 Cl2] is

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 45

Pt (NH3)2 Cl2 is a disubstituted complex and shows only cis-& trans-isomers

31 Year NEET Previous Year Questions: Coordination Compounds - Question 46

The formula for the complex, dichlorobis (urea) copper (II) is [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 46

31 Year NEET Previous Year Questions: Coordination Compounds - Question 47

Which of the following statements is correct ? (Atomic number of Ni = 28) [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 47


In Ni(CO)4, Ni is in the zero oxidation state i.e., it has a configuration of 3d8 4s2.

But CO is a strong field ligand. Therefore, it causes the pairing of unpaired 3d electrons. Also, it causes the 4s electrons to shift to the 3d orbital, thereby giving rise to sp3 hybridization. Since no unpaired electrons are present in this case, [Ni(CO)4] is diamagnetic.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 48

The number of geometrical isomers of the complex [Co(NO2)3 (NH3)3] is [1997]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 48

[Co(NO2)3 (NH3)3]

Possible geometrical isomers

Total geometrical isomers = 2

31 Year NEET Previous Year Questions: Coordination Compounds - Question 49

 The total number of possible isomers for the complex compound [CuII (NH3)4] [PtII Cl4] [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 49

The total number of isomers for the complex compound

These four isomers are

The isomer [Cu (NH3)2 Cl2][Pt (NH3)2 Cl2] does not exist due to both parts being neutral.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 50

IUPAC name of [Pt(NH3)3 (Br) (NO2) Cl] Cl is [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 50

We know that IUPAC name of [Pt (NH3)3 (Br) (NO2)Cl]Cl is triamminebromochloronitroplatinum (IV) chloride.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 51

A co-ordination complex compound of cobalt has the molecular formula containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution. On reacting this solution with excess of AgNO3 solution, we get two moles of AgCl precipitate. The ionic formula for this complex would be [1998]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 51

As it forms two moles of silver chloride thus it has two moles of ionisable Cl.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 52

In which of the following compounds does iron exhibit zero oxidation state? [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 52

In [Fe(CO)5] Iron exist in zero oxidation state

31 Year NEET Previous Year Questions: Coordination Compounds - Question 53

Which one of the following will show paramagnetism corresponding to 2 unpaired electrons?(Atomic numbers : Ni = 28, Fe = 26) [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 53

As in [NiCl4]–2 Chloride ion being a weak ligand is not able to paired the electron in d orbital.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 54

The number of unpaired electrons in the complex [Cr(NH3)6]Br3 is (Atomic number Cr = 24)

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 54

In [Cr (NH3)6]Br3, Cr is in +3 oxidation state etc.

presence of three unpaired electrons it is paramagnetic.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 55

Which one of the following complexes will have four different isomers ? [2000]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 55

Complex Co(en)(NH3)2Cl2]Cl will have four different isomers.

(i) Geometrical isomers

(ii) Optical isomers

31 Year NEET Previous Year Questions: Coordination Compounds - Question 56

Which of the following will give maximum number of isomers? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 56

[Cr(SCN)2 ( NH3) 4]+ shows linkage , geometrical and optical isomerism. Hence produces maximum no. of isomers.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 57

Which of the following will exhibit maximum ionic conductivity? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 57

The complex ions which give maximum ion in solution exhibit maximum ionic conductivity

31 Year NEET Previous Year Questions: Coordination Compounds - Question 58

Which statement is incorrect? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 58

(CO) carbonyl group being a strong ligand paired all electrons present in d orbital of Ni.
Hence form dsp2 hybrid orbitals and hence the shape of molecule is square planar.
In Ni(CO)4 complex, Ni will have 3d10 configuration. It has tetrahedral geometry but diamagnetic as there are no unpaired electrons.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 59

Which of the following organometallic compound is σ and π bonded? [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 59

[Co(CO) 5 NH3]2+ . In this complex. Coatom attached with NH3 through σ bonding with CO attached with dative π-bond.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 60

Oxidation number of Ni in [Ni(C2O4)3]4– is [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 60

31 Year NEET Previous Year Questions: Coordination Compounds - Question 61

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic? [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 61

Cr3+ has 4sº 3d3 electronic configuration with 3 unpaired electrons, hence paramagnetic.
In other cases pairing of d-electrons take place in presence of strong field ligands such as CO or CN.
In Cr(CO)6 molecule 12 electrons are contributed by CO group and it contain no odd electron

31 Year NEET Previous Year Questions: Coordination Compounds - Question 62

The hypothetical complex chlorodiaquotriammine cobalt (III) chloride can be represented as [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 62

Chloro diaquatriammine cobalt (III) chloride is [CoCl(NH3)3(H2O)2]Cl2

31 Year NEET Previous Year Questions: Coordination Compounds - Question 63

 CuSO4 when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN due to formation of the following complex [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 63

Copper sulphate react with KCN to give white ppt of Cu(CN)2 and cyanogen gas. The insoluble copper cynaide dissolve in excess of KCN and give soluble potassium cuprocyanide

31 Year NEET Previous Year Questions: Coordination Compounds - Question 64

Which one of the following octahedral complexes will not show geometric isomerism? ( A and B are monodentate ligands) [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 64

MA3 B3 – 2 geometrical isomers
MA2 B4 – 2 geometrical isomers
MA4 B2 – 2 geometrical isomers
The complexes of general formula Ma6 and Ma5b octahedral geometry do not show geometrical isomerism.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 65

According to IUPAC nomenclature sodium nitroprusside is named as [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 65

IUPAC name of sodiumnitroprusside Na2[Fe(CN)5NO] is sodium pentacyanonitrosoyl ferrate (III) because in it NO is neutral ligand.
Hence 2×O.N. of Na + O.N. of Fe + 5×O.N. of CN       1×O.N. of NO = 02×(+1) + O.N. of Fe + 5 ×(–1) +1×0 = 0
O.N. of Fe = 5 – 2 = +3,  
Hence ferrate (III)

31 Year NEET Previous Year Questions: Coordination Compounds - Question 66

 The number of unpaired electrons in the complex ion [CoF6]3– is (Atomic no.: Co = 27) [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 66

Cohere is in +3 oxidation state

Unpaired electrons  = 4 and sp3d2 hybridisation and octahedral shape.

31 Year NEET Previous Year Questions: Coordination Compounds - Question 67

Among the following, which is not the π-bonded organometallic compound? [2003]

Detailed Solution for 31 Year NEET Previous Year Questions: Coordination Compounds - Question 67

π bonded organometallic compounds is indicated by the greek latter 'η' with a number.
The prefixes η2, η5 and η6 indicate that 2, 5 and 6 carbon atom are bound to the metal in the compound.(CH3)4Sn does not involve any pi (π) bond formation. This is a π bonded organometallic compound

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