NEET Chemistry Coordination Compounds Questions Solved

NEET - 2017

An example of a sigma bonded organometallic compound is

(a) ruthenocene                  (b) Grignard's reagent

(c) ferrocene                      (d) cobaltocene

 

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

(b) The organometallic compounds having sigma bond between carbon and metal are sigma bonded organometallic. An example of a sigma bonded organometallic compound is Grignard's reagent

                             R-Mg-Xσ-bond

Whereas, ruthenocene, ferrocene and cobaltocene are not sigma bonded organometallic compound.

 

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NEET - 2017

The correct order of the stoichiometrics of AgCl formed when AgNO3 in excess is treated with the complexes:- CoCl3.6NH3, CoCl3.5NH3, CoCl3.4NH3 respectively is

(a) 1 AgCl, 3 AgCl, 2 AgCl
(b) 3 AgCl, 1 AgCl, 2 AgCl
(c) 3 AgCl, 2 AgCl, 1 AgCl
(d) 2 AgCl, 3AgCl,  1 AgCl

Concept Videos :-

#27 | Werner Theory

Concept Questions :-

Werner’s Theory

(c) According to Werner’s theory,

CoCl3.6NH3 → [Co(NH3)6]3+3Cl-
CoCl3.5NH3 → [Co(NH3)5Cl]2+2Cl-
CoCl3.4NH3 → [Co(NH3)4Cl2]+Cl-

When AgNO3 in excess is treated with these complexes then following reactions takes place:-

[Co(NH3)6]3+3Cl-+AgNO3(Excess)→3AgCl+[Co(NH3)6]3+
[Co(NH3)5]2+2Cl-+AgNO3(Excess)→2AgCl+[Co(NH3)5]2+
[Co(NH3)4Cl2]+Cl-+AgNO3(Excess)→AgCl+[Co(NH3)4 Cl2]+

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NEET - 2017

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of CO3+ is

(a) [CO(en)3]3+, [CO(NH3)63+  CO(H2O)6]3+

(b) [CO(H2O)6]3+, [CO(en)3]3+. [CO(NH3)6]3+

(c) [CO(H2O)6]3+, (CO(NH3)6]3+ , [CO(en)3]3+

(d) [CO(NH2)8]3+, [CO(en)3]3+, [CO(H2O)6]3+

(a) Key concept Wavelength (λ) of absorption is inversely proportional to CFSE (0 value) of ligands attached with the central metal ion

According to spectrochemical series.

I-<Br-<S2-<SCN-<Cl-<F-<OH-<C2O2-4<O2-<H2O<NSS-<NH3<en<NO-2<CN-

The CFSE of ligands attached with CO3+ ion is in the order

en > NH3 > Hp (From spectrochemical series) v Wavelength of absorbed light  

The order of wavelength of absorption in the visible region will be : en < NH3 < H2O or.[Co(en)3,)3+ [CO(NH3)3+ < [CO(H2O)6]3+

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NEET - 2017

Pick out the correct statement with respect to [Mn(CN)6]3-

(a) it is sp3d2 hybridised and octahedral

(b) It is sp3d2 hybridised and tetrahedral

(c) It is d2sp3 hybridised and octahedral

(d) It is dsp2 hybridised and square planar

Concept Videos :-

#1 | Definition of Double Salts & Coordination Compounds
#2 | Some Basic Concepts of Coordination Compounds
#4 | Stable & Unstable Complex
#5 | Perfect & Imperfect Complex
#6 | Basic Terms of Coordination Compounds

Concept Questions :-

Coordination comp,Introduction and Classification / Nomenclature

(c) [Mn(CN)6]3- is d2sp3 hybridisedand octahedral in [Mn(CN)6]3- Mn is in +3 oxidation state

Mn3+ = 3d4 4s0

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NEET - 2016

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- >NH> C6H5-

 

(d) CN- > Br- >C6H5- >NH3

 

 

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

(b) Trans effect is the effect of a coordinated group upon the rate of substitution at the position trans to itself in a square or octahedral complex. As the rate of substitution of the trans ligand increases, the intensity of trans effect also increases. Thus, correct order is,

CN- > C6H5- > Br- > NH3

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NEET - 2016

Jahn-Teller effect is not observed in high spin complexes of

(a) d7

(b) d8

(c) d4

(d) d9

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

(b) Key Idea Jahn-Teller distortion is observed in those octahedral complexes in which d-electrons are filled unsymmetricaily.

Except d8, all are unsymmetricaily filled, thus d8 complex will not show Jahn-Teller distortion.

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NEET - 2016

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 Å.)
(a) [Co(СО)4]-
(b) [Fe(CO)4]2-
(c) [Mn(CO)6]+
(d) Ni(CO)4

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

(b) As negative charge on metal carbonyl complex increases, back p-bonding increases and hence bond length of C-O bond increases while bond length of metal-carbon bond decreases.

Hence, [Fe(CO)4]2- has longest C-O bond length among the given complexes.

The correct order of bond length of the given complexes is

MnCO6+ < NiCO4 < CoCO4- < FeCO42-

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Which of the following statements is false?

(a) Ca2+ ions are important in blood clotting

(b) Ca2+ ions are not important in maintaining the regular beating of the heart

(c) Mg2+ ions are important in the green parts of plants

(d) Mg2+ ions form a complex with ATP

Concept Videos :-

#1 | Definition of Double Salts & Coordination Compounds
#2 | Some Basic Concepts of Coordination Compounds
#4 | Stable & Unstable Complex
#5 | Perfect & Imperfect Complex
#6 | Basic Terms of Coordination Compounds

Concept Questions :-

Coordination comp,Introduction and Classification / Nomenclature

(b) Ca2+ ions are very important factor in blood clotting.

• Ca2+ ions are very important for maintaining the regular heart beating.

• Mg2+ ions is present in the green parts of plants i.e., chlorophyll.

• Mg2+ can form a complex with ATP.

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NEET - 2015

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25°C?

(a) CoCl3.3NH3

(b) CoCl3 .NH3

(c) CoCI3 .5NH3

(d) CoCl3.6NH3

Concept Videos :-

#27 | Werner Theory

Concept Questions :-

Werner’s Theory

[Co(NH3)6]Cl3 [Co(NH3)6]3+ + 3Cl-

[Co(NH3)3]Cl3 [Co(NH3)2Cl3]

[Co(NH3)4Cl2)Cl [Co(NH3)4 Cl2]+ +Cl-

[Co(NH3)5Cl]Cl2  [Co(NH3)5]2+ + 2Cl-

So, [Co(NH3)3]Cl3] does not ionise so does not give test for chloride ions.

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NEET - 2015

Which of these statements about [CO(CN)6]3- is true?

(a) [CO(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.

(b) [CO(CN)6]3- has four unpaired electrons and will be in a low-spin configuration.

(c) [CO(CN)6]3- has four unpaired electrons and will be in a high-spin configuration.

(d) [CO(CN)6]3- has no unpaired electrons and will be in a high-spin configuration.

Concept Videos :-

#23 | VBT & CFT: I
#24 | VBT & CFT: II
#25 | VBT & CFT: III
#26 | Colour of Coordination Compounds

Concept Questions :-

VBT & CFT, Limitation /Hybridisation

[CO(CN)6]3-

CO3+ = 1S22s22p63s23p63d6

CN- is a strong field ligand and as it approaches the metal ion. the electrons must pair up.

The splitting of the d-orbitals into two sets of orbitals in an octahedral [Co(CN)6)3- may be represented as

Here, for dions, three electrons first enter orbitals with parallel spin put the remaining may pair up in t2g orbital giving rise to low spin complex (strong ligand) field.

[CO(CN)6]3- has no unpaired electron and will be in a low spin configuration

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