Ammoniacal solution of ${\rm{Ni}}{\left( {{\rm{CN}}} \right)_2}$ reacts with ${{\rm{C}}_6}{{\rm{H}}_6}$ to produce a light violet coloured crystalline compound of the formula:

${\rm{Ni}}{\left( {{\rm{CN}}} \right)_2}{\rm{N}}{{\rm{H}}_3} \cdot {{\rm{C}}_6}{{\rm{H}}_6}$

${\rm{Ni}}{\left( {{\rm{CN}}} \right)_2} \cdot {{\rm{C}}_6}{{\rm{H}}_5}$

${{\rm{C}}_6}{{\rm{H}}_5}{\rm{C}}{{\rm{H}}_3}$

${\rm{Ni}}{\left( {{\rm{CN}}} \right)_2}{{\rm{C}}_6}{{\rm{H}}_6}$

The IUPAC name of ${{\rm{K}}_2}\left[ {{\rm{PtC}}{{\rm{l}}_6}} \right]$ is

Potassium hexachloroplatinum(IV)

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NEET • CHEMISTRY • CO-ORDINATION COMPOUNDS

Co-ordination compounds practice · Mixed difficulty

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91 Medium

91 of 320

Remembering +4 | -1

Increasing order of

\Delta_0

of the following complex is

View answer and explanation

Correct option: C

\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}< \left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]^{3+}< \left[\mathrm{Cr}(\mathrm{CN})_6\right]^{3-}

The correct answer is C (

\mathrm{Cr}(\mathrm{H}_2 \mathrm{O})_6^{3+}< \mathrm{Cr}(\mathrm{NH}_3)_6^{3+}< \mathrm{Cr}(\mathrm{CN})_6^{3-}

) because the spectrochemical series dictates the increasing order of ligand field splitting strength.

92 Medium

92 of 320

Application +4 | -1

Chemical formula for iron (III) hexacyanoferrate (II) is

View answer and explanation

Correct option: D

F{e_4}{\left[ {Fe{{(CN)}_6}} \right]_3}

Option D (

Fe_4[Fe(CN)_6]_3

) is correct because it represents the correct ratio of Fe(III) and hexacyanoferrate(II) to achieve charge neutrality.

93 Easy

93 of 320

Understanding +4 | -1

Which statement about coordination number of a cation is true?

View answer and explanation

Correct option: D

For most cations, the coordination number depends on the size, structure and charge of the ligands

Option D (For most cations, the coordination number depends on the size, structure and charge of the ligands) is correct because these factors influence how many ligands can effectively coordinate to the metal center.

94 Easy

94 of 320

Application +4 | -1

Oxidation number of

\mathrm{Fe}

{\mathrm{K}_3}\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]

is:

View answer and explanation

Correct option: A

Option A (3) is correct because the oxidation state of Fe is calculated based on the charge of the complex and the ligands.

95 Easy

95 of 320

Remembering +4 | -1

The number of unidentate ligands in the complex ion is called

View answer and explanation

Correct option: C

Coordination number

Option A (

- \mathrm{COOH},\mathrm{\;} - \mathrm{CHO},\mathrm{\;} - \mathrm{OH},\mathrm{\;} - \mathrm{N}{\mathrm{H}_2}

) is correct because it represents the correct decreasing order of priority for functional groups in IUPAC nomenclature.

96 Easy

96 of 320

Application +4 | -1

Which follows EAN rule?

View answer and explanation

Correct option: D

All are correct

Option D (All are correct) is correct because all the given complexes,

\mathrm{Fe}{\left( {\mathrm{CO}} \right)_5}

\mathrm{Ni}{\left( {\mathrm{CO}} \right)_4}

, and

{\mathrm{K}_4}\left[ {\mathrm{Fe}{{\left( {\mathrm{CN}} \right)}_6}} \right]

, follow the Effective Atomic Number (EAN) rule.

97 Hard

97 of 320

Analyzing +4 | -1

Among the statements (A) - (D), the incorrect ones are
(A) Octahedral Co(III) complexes with strong, field ligands have very high magnetic moments
(B) When

{\Delta _0}\, < \,P

, the

d

-electron configuration of Co(III) in an octahedral complex is

t_{eg}^4,\,\,e_g^2

\,{[Co{(en)_3}]^{3 + }}

is lower than that of

{[Co{F_6}]^{3 - }}

(D) If the

{\Delta _0}

for an octahedral complex of Co(III) is

18,000\,\mathrm{c}{\mathrm{m}^{ - 1}}

, the

{\Delta _t}

for its tetrahedral complex with the same Ligand will be

16,000\,\mathrm{c}{\mathrm{m}^{ - 1}}

View answer and explanation

Correct option: D

(A) and (D) only

Option D ((A) and (D) only) is correct because octahedral Co(III) complexes with strong field ligands are low spin and have low magnetic moments, and the relationship between

\Delta_0

and

\Delta_t

is not correctly represented.

98 Medium

98 of 320

Remembering +4 | -1

Ligands in a complex salt are:

View answer and explanation

Correct option: D

Ions or molecules linked by coordinate bonds to a central metal atom or ion

Option A. Primary valencies are ionizable is correct because Werner's theory states that primary valencies (oxidation state) are satisfied by negative ions and are ionizable.

99 Hard

99 of 320

Understanding +4 | -1

Synergic bonding in metal carbonyl complexes

[{M}=

metal

]

______

(i) decreases

{C}-{O}

bond strength

(ii) increases

{M}-{C}

bond length

(iii) increases bond order for

{M}-{C}

bond

View answer and explanation

Correct option: B

(i) and (iii)

The correct answer is B ((i) and (iii)). Synergic bonding in metal carbonyls involves back-donation from the metal to the CO ligand, which decreases the C-O bond strength and increases the M-C bond order.

100 Medium

100 of 320

Remembering +4 | -1

In the change

\left[{Cu}\left({H}_2 {O}_6\right)\right]^{2+} \stackrel{{HCl}}{\longrightarrow}\left[{CuCl}\left({H}_2 {O}\right)_5\right]^{+}

, the colour changes from

View answer and explanation

Correct option: B

Blue to pink

Option B is correct because the addition of HCl to [Cu(H2O)6]2+ results in the replacement of water ligands with chloride ligands, leading to a change in color from blue to pink.

101 Medium

101 of 320

Application +4 | -1

A complex of cobalt has five ammonia molecules, one nitro group and two chlorine atoms for each cobalt atom. One mole of this compound produces three mole ions in aqueous solution which on treating with excess of

\mathrm{AgN}{\mathrm{O}_3}

give two mole of

\mathrm{AgCl}

. The formula of the compound is:

View answer and explanation

Correct option: C

\left[ {\mathrm{Co}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_5}\mathrm{N}{\mathrm{O}_2}} \right]\mathrm{C}{\mathrm{l}_2}

The correct answer is C (

\left[ {\mathrm{Co}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_5}\mathrm{N}{\mathrm{O}_2}} \right]\mathrm{C}{\mathrm{l}_2}

) because the complex produces three ions in solution, and two moles of AgCl are formed, indicating two chloride ions are outside the coordination sphere.

102 Medium

102 of 320

Analyzing +4 | -1

Which among the following is not an outer orbital complex?

View answer and explanation

Correct option: A

{\left[ {Co{{\left( {{C_2}{O_4}} \right)}_3}} \right]^{3 - }}

Option A (

{\left[ {Co{{\left( {{C_2}{O_4}} \right)}_3}} \right]^{3 - }}

) is correct because oxalate is a strong field ligand, leading to inner orbital complex formation.

103 Hard

103 of 320

Application +4 | -1

Which one of the following will show paramagnetism corresponding to 2 unpaired electrons?
(Atomic numbers:

{Ni}=28, {Fe}=26

)

View answer and explanation

Correct option: B

\left[{NiCl}_4\right]^{2-}

Option B (

\left[{NiCl}_4\right]^{2-}

) is correct because it has a tetrahedral geometry with two unpaired electrons due to weak field ligand.

104 Easy

104 of 320

Remembering +4 | -1

Ziegler-Natta catalyst is

View answer and explanation

Correct option: C

\mathrm{[A}{\mathrm{l}_2}{\left( {{\mathrm{C}_2}{\mathrm{H}_6}} \right)_6} + \mathrm{TiC}{\mathrm{l}_4}]

Option C (

\mathrm{[A}{\mathrm{l}_2}{\left( {{\mathrm{C}_2}{\mathrm{H}_6}} \right)_6} + \mathrm{TiC}{\mathrm{l}_4}]

) is correct because Ziegler-Natta catalysts typically consist of a transition metal compound (like

TiCl_4

) and an organometallic compound (like triethylaluminum).

105 Medium

105 of 320

Remembering +4 | -1

Which of the following spectrochemical series is true?

View answer and explanation

Correct option: B

{SCN}^{-} < {F}^{-} < {NH}_3 <

< {CO}

Option B is correct because the correct spectrochemical series order is SCN- < F- < NH3 < en < CO, reflecting the increasing ligand field strength.

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106 Medium

106 of 320

Application +4 | -1

Spin only magnetic moment of which complex is highest?

View answer and explanation

Correct option: C

\left[\mathrm{FeF}_{{6}}\right]^{3-}

Option C (

\left[\mathrm{FeF}_{{6}}\right]^{3-}

) is correct because

Fe^{3+}

has a

d^5

configuration and

F^-

is a weak field ligand, leading to a high-spin complex with 5 unpaired electrons, resulting in the highest spin-only magnetic moment.

107 Medium

107 of 320

Analyzing +4 | -1

Which of the following is an incorrect statement?

View answer and explanation

Correct option: D

EDTA { }^{4-}

is a tetradentate ligand

Option D is the incorrect statement because EDTA

^{4-}

is a hexadentate ligand, not a tetradentate ligand.

108 Easy

108 of 320

Application +4 | -1

Which of the following shows

ds{p^2}

hybridisation?

View answer and explanation

Correct option: D

\mathrm{PtCl}_4^{2 - }

Option D (PtCl4^2-) is correct because Pt in this complex has a coordination number of 4 and forms a square planar complex, which requires dsp² hybridization.

109 Medium

109 of 320

Remembering +4 | -1

Which of the following compounds is generally used for hydrogenation of alkene?

View answer and explanation

Correct option: B

\left[\left({C}_6 {H}_5\right)_3 {P}\right]_3 {RhCl}

Option B (

\left[\left({C}_6 {H}_5\right)_3 {P}\right]_3 {RhCl}

) is correct because it represents Wilkinson's catalyst, a well-known catalyst for alkene hydrogenation.

110 Hard

110 of 320

Application +4 | -1

Which of the following complexes do not follow EAN rule?

View answer and explanation

Correct option: B

\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}

Option B ([Fe(CN)6]3-) is correct because it does not follow the EAN rule; the EAN is not equal to the atomic number of the next noble gas.

111 Hard

111 of 320

Application +4 | -1

On treatment of

100 \mathrm{~mL}

0.1 \mathrm{M}

solution of the complex

\mathrm{CoCl}_3 \cdot 6 \mathrm{NH}_3

with excess of

\mathrm{AgNO}_3, 4.305 \mathrm{~g}

\mathrm{AgCl}

was obtained. What is the positive charge present on the complex ion?

View answer and explanation

Correct option: A

Option A (3) is correct because the amount of AgCl precipitated corresponds to 3 chloride ions being outside the coordination sphere, resulting in a +3 charge on the complex ion.

112 Easy

112 of 320

Understanding +4 | -1

Which of the following is an organometallic compound?

View answer and explanation

Correct option: D

\mathrm{Ti}{\left( {{\mathrm{C}_2}{\mathrm{H}_5}} \right)_4}

Option D (

\mathrm{Ti}{\left( {{\mathrm{C}_2}{\mathrm{H}_5}} \right)_4}

) is correct because it contains a direct titanium-carbon bond, which is the defining characteristic of an organometallic compound.

113 Hard

113 of 320

Understanding +4 | -1

Which of the following sets is/are example(s) of co-ordination isomerism is complex?

View answer and explanation

Correct option: A

\left[{Co}\left({NH}_3\right)_6\right][{Cr}({CN})_6]

and

\left[{Co}\left({CN}_6\right)\right]\left[{Cr}\left({NH}_3\right)_6\right]

Option A is correct because

\left[{Co}\left({NH}_3\right)_6\right][{Cr}({CN})_6]

and

\left[{Co}\left({CN}_6\right)\right]\left[{Cr}\left({NH}_3\right)_6\right]

involve the exchange of ligands between the cationic and anionic coordination entities.

114 Medium

114 of 320

Application +4 | -1

Which does not obey EAN rule?

View answer and explanation

Correct option: A

{\left[ {\mathrm{Cu}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]^{2 + }}

Option A (

{\left[ {\mathrm{Cu}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]^{2 + }}

) does not obey the EAN rule because its EAN is 29, not the nearest noble gas number.

115 Easy

115 of 320

Understanding +4 | -1

Which of the following is not considered as an organometallic compound?

View answer and explanation

Correct option: B

cis -

platin

Option B (

cis -

platin) is correct because it does not have a direct metal-carbon bond, which is a requirement for a compound to be classified as organometallic.

116 Medium

116 of 320

Understanding +4 | -1

Ammoniacal solution of

\mathrm{Ni}{\left( {\mathrm{CN}} \right)_2}

reacts with

{\mathrm{C}_6}{\mathrm{H}_6}

to produce a light violet coloured crystalline compound of the formula:

View answer and explanation

Correct option: D

\mathrm{Ni}{\left( {\mathrm{CN}} \right)_2}\mathrm{N}{\mathrm{H}_3} \cdot {\mathrm{C}_6}{\mathrm{H}_6}

Option D (

\mathrm{Ni}{\left( {\mathrm{CN}} \right)_2}\mathrm{N}{\mathrm{H}_3} \cdot {\mathrm{C}_6}{\mathrm{H}_6}

) is correct because the reaction involves the formation of a complex containing nickel cyanide, ammonia, and benzene.

117 Easy

117 of 320

Remembering +4 | -1

\mathrm{SCN}

ligand if

\mathrm{N}

is attached to central atom, the name of ligand is:

View answer and explanation

Correct option: A

Thiocyanato-N

Option A (Thiocyanato-N) is correct because when N is attached to the central atom in SCN ligand, it's named Thiocyanato-N.

118 Easy

118 of 320

Understanding +4 | -1

The IUPAC name of

{\mathrm{K}_2}\left[ {\mathrm{PtC}{\mathrm{l}_6}} \right]

View answer and explanation

Correct option: B

Potassium hexachloroplatinate (IV)

Option B (Potassium hexachloroplatinate (IV)) is correct because it correctly names the compound, indicating the potassium cation, the hexachloro ligands, the platinate anion, and the oxidation state of platinum.

119 Hard

119 of 320

Analyzing +4 | -1

Which of the following will have maximum stabilization due to crystal field?

View answer and explanation

Correct option: C

{[Co{(CN)_6}]^{ - 3}}

Option C (

{[Co{(CN)_6}]^{ - 3}}

) is correct because it exhibits the highest crystal field stabilization energy due to the strong field ligand CN- and the resulting low spin configuration.

120 Medium

120 of 320

Understanding +4 | -1

Pick a poor electrolytic conductor complex in solution:

View answer and explanation

Correct option: D

\left[ {\mathrm{Co}{{\left( {\mathrm{N}{\mathrm{H}_3}} \right)}_4}} \right]\mathrm{S}{\mathrm{O}_4}

Option B ([Co(NH3)3](NO2)3) is a poor electrolytic conductor because it does not dissociate into ions in solution.

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