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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 9 Coordination Compounds

NCERT Solution For Class 12 Chemistry Chemistry I

Coordination Compounds Here is the CBSE Chemistry Chapter 9 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Chemistry Coordination Compounds Chapter 9 NCERT Solutions for Class 12 Chemistry Coordination Compounds Chapter 9 The following is a summary in Hindi and English for the academic year 2024-25. You can save these solutions to your computer or use the Class 12 Chemistry.

Question 1

Formula	Motes of AgCl precipitated with excess AgNO₃
(i) PdCl_2.4NH₃	2
(ii) NiCl_2.6H₂O	2
(iii) PtCl₄.2HCl	0
(iv) CoCl₃.4NH₃	1
(v) PtCl₂.2NH₃	0

Column I		Column II
a.	Co³⁺	i.	$\sqrt{\sqrt{8} B M}$
b.	Cr³⁺	ii.	$\sqrt{35} B M$
c.	Fe³⁺	iii.	$\sqrt{3} B M$
d.	Ni²⁺	iv.	$\sqrt{24} B M$
		v.	$\sqrt{15} B M$

a	b	c	d
i	ii	iii	iv

a	b	c	d
iii	v	i	ii

a	b	c	d
iv	i	ii	iii

NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 9 Coordination Compounds

NCERT Solution For Class 12 Chemistry Chemistry I

Write the formula for the following coordination compound:Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:(i) [Co(NH3)6]Cl3(ii) [Co(NH3)5Cl]Cl2(iii) K3[Fe(CN)6](iv) K3[Fe(C2O4)3](v) K2[PdCl4] (vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:(i) K[Cr(H2O)2(C2O4)2], (ii) [Co(en)3Cl3, (iii) [Co(NH3)5(NO2)]|NO3]2, (iv) [Pt(NH3)(H2O)Cl2]

Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionisation isomers.

Explain on the basis of valence bond theory that [Ni(CN)4]2– ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.

[NiCl]42- is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?

[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3- is weakly paramagnetic. Explain.

Explain Co(NH3)63+ is an inner orbital complex whereas Ni(NH3)62+ is an outer orbital complex.

Predict the number of unpaired electrons in the square planar [Pt(CN)4,]2– ion.

The hexaquo manganese(II) ion contains five unpaired electrons, while the hexacynoion contains only one unpaired electron. Explain using crystal field theory.

Calculate the overall complex dissociation equilibrium constant for the Cu(NH3)42+ion, given β4 for this complex is 2.1 x 1013.

Identify the ligands from the following coordination compounds:(a) [Co(en)2Cl(NO2)2](b) K[Co(CN)(CO2)(NO)](c) K3[Al(OH)6](d) [Co(H2O)2(NH3)4](OH)3

Write IUPAC name of the following complexes:(a) [Fe(H2O)6]SO4(b) [Cu(en)2(NO3)2

Give IUPAC name of the following complexes:(i) Na2[Fe(CN)5(NO)], (ii) K2[Zn(CN)4]

Provide systematic names to the following complexes:(i) [Fe(H2O)5(NO)]SO4, (ii) [Cr(NH3)6]3+(iii) [Pt(NH3)2Cl2], (iv) [NiCl4]2–

Write the chemical formula of:(i) Sodium tetrahydridoborate(III).(ii) Tetrahydroxo zincate(II) ion.

What are the basic difference between the two geometrical isomers – cis/trans or fac/ mor?

Specify which out of the following complex structures exhibit geometrical isomerism:(a) Linear, (b) Square planar, (c) Tetrahedral, (d) Octahedral.

Give two examples of positive mono-denate ligands.

Give an example of neutral bidentate ligand.

Give an example of hexadentate ligand.

Why is geometrical isomerism not possible in tetrahedral complexes having two different types of unidentate ligands coordinated with the central metal ion ?

Write all isomers of [Co(C2O4)3]3–.

Draw structures of geometrical isomers of [Fe(NH3)2(CN)4]–.

Which isomer of [CoCl2(en)2]+ does not show optical isomerism?

Illustrate the geometrical isomers of [Pt(NH3)4Cl2]+.

FeSO4 solution mixed with (NH4)2SO4 solution in 1 : 1 molar ratio gives the test of Fe2+ ion but CuSO4 solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu2+ ion. Explain why?

How many coordination sites are there in ethylene diamine CH3NH2?

Which type of ligands form chelates?

What is the shape of [Co(NH3)6]3+ complex ion?

What are the most common coordination number encountered in coordination compounds?

What is the oxidation state of Ni in Ni(CO)4?

Give the geometry and magnetic character of [NiCl4]2–?

Give one example of hexadentate ligand. Give its use.

What is coordination number? Give coordination of Co in [Co(en)3]3+ ion.

Identify the ligands in [Co(en)2 Cl(ONO)]+ and write its IUPAC name.

Which of these cannot act as ligand and why: NH3, H2O, CO, CH4 ?

NH3 is strong ligand, NH4+ ion is not, why?

Name the ionization isomer of [Cr(H2O)5Br]SO4?

Write the IUPAC name for any of the isomers with the molecular formula [Pt(NH3)2Cl2]Cl2.

What is the coordination number of central metal ion in [Fe(C2O4)3]3–?

Name the type of isomerism exhibited by the following isomers.[Pt(NH3)4] [PtCl6] and [Pt(NH3)4Cl2] [PtCl4]

Write the IUPAC name of [Co(en)2 (NH3)2]Cl3.

What are complex compounds? Give one example?

Write the formula of the following complexes:(i) Hexa-amine platinum(IV) chloride.(ii) Dichloro tetra amine cobalt(III) ion.

What is the coordination number and oxidation state of aluminium in the complex ion [Al(H2O)4(OH)2] +?

Write all the isomers of |Pt(SCN) (NH3)3] (SCN).

Why inner octahedral complexes are called low spin complexes?

Why outer octahedral complexes are celled high spin complexes?

Name the ligands which are regarded as strong crystal fields and causes pairing of electrons.

What is the crystal fields Theory?

What are the consequence of crystal fields?

How the coordinate entities show colour?

The colour of the coordination entity is decided on which factor?

What is the oxidation state of gold in [Au(CN)2]–?

Which of the two is more stable K4[Fe(CN)6] or K3[Fe(CN)6].

Draw cis- and trans-isomers of [Pt(NH3)2Cl2].

Write IUPAC name of K3[Fe(C2O4)3].

Give two complexes which are used in medicines.

[Fe(CN)6]3– is weakly paramagnetic while [Fe(CNO)6]4– is diamagnetic, why?

A coordination compound has the formula CoCl3.4NH3. It does not liberate NH3 but forms a precipitate of AgCl on treatment with AgNO3 solution. Write the structure and IUPAC name of the complex.

Explain why chelating complex is more stable than unchelated complex?

Write down the IUPAC names of the following compounds:(i) [CO(NH3)5ONO ]Cl2 (ii) K3[Cr(CN)6]

Write the IUPAC name for [Cr(NH3)5 CO3]Cl.

Give the name of a bidentate ligand.

What is Wilkinson’s catalyst? Where is it used?

Write the IUPAC name of [Ni(CN)4]2– ion?

Nickel carbonyl( NiCO4) has tetrahedral geometry whereas [Pt(NH3)2Cl2] is square planar.

Write the expression for the stability’ constant for [Cu(NH3)4]2+.

The value of equilibrium constants of [Cu(NH3)4]+ and [Co(NH3)6]3+ are 1.0 x 10–12 and 6.2 x 10–36 respectively. Which complex would be more stable and why ?

In octahedral complexes which two d-orbitals are used in hybridization.

If the value of Δ0 is less than P in the crystal field, write the arrangement of d4coordination entity in crystal field split.

How is ammonia molecule is a good ligand?

Write the formula for the following coordination compound:
Tetraaminediaquacobalt(lll)chloride

Write the formula for the following coordination compound:
Potassium tetracyanidonickelate(II)

Write the formula for the following coordination compound:
Tris(ethane -1, 2-diamine) chromium(III) chloride

Write the formula for the following coordination compound:
Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH₃)₆]Cl₃(ii) [Co(NH₃)₅Cl]Cl₂
(iii) K₃[Fe(CN)₆]
(iv) K₃[Fe(C₂O₄)_3]
(v) K₂[PdCl4]
(vi) [Pt(NH₃)₂Cl(NH₂CH₃)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i) K[Cr(H₂O)₂(C₂O₄)₂], (ii) [Co(en)₃Cl₃,
(iii) [Co(NH₃)₅(NO₂)]|NO₃]₂, (iv) [Pt(NH₃)(H₂O)Cl₂]

Give evidence that [Co(NH₃)₅Cl]SO₄ and [Co(NH₃)₅SO₄]Cl are ionisation isomers.

Explain on the basis of valence bond theory that [Ni(CN)₄]^2– ion with square planar is diamagnetic and the [NiCl₄]^2– ion with tetrahedral geometry is paramagnetic.

$[NiCl {]_{4}}^{2 -}$ is paramagnetic while $[Ni (CO)_{4}]$ is diamagnetic though both are tetrahedral. Why?

$[Fe (H_{2} O)_{6}]^{3 +}$ is strongly paramagnetic whereas $[Fe (CN)_{6}]^{3 -}$ is weakly paramagnetic. Explain.

Explain ${[Co ({NH}_{3})_{6}]}^{3 +}$ is an inner orbital complex whereas ${[Ni ({NH}_{3})_{6}]}^{2 +}$ is an outer orbital complex.

Predict the number of unpaired electrons in the square planar [Pt(CN)₄,]^2– ion.

Calculate the overall complex dissociation equilibrium constant for the Cu(NH₃)₄²⁺ion, given β₄ for this complex is 2.1 x 10¹³.

Identify the ligands from the following coordination compounds:
(a) [Co(en)₂Cl(NO₂)₂]
(b) K[Co(CN)(CO₂)(NO)]
(c) K₃[Al(OH)₆]
(d) [Co(H₂O)₂(NH₃)₄](OH)₃

Write IUPAC name of the following complexes:
(a) [Fe(H₂O)₆]SO₄
(b) [Cu(en)₂(NO₃)₂

Give IUPAC name of the following complexes:
(i) Na₂[Fe(CN)₅(NO)], (ii) K₂[Zn(CN)₄]

Provide systematic names to the following complexes:
(i) [Fe(H₂O)₅(NO)]SO₄,
(ii) [Cr(NH₃)₆]³⁺(iii) [Pt(NH₃)₂Cl₂],
(iv) [NiCl₄]^2–

Write the chemical formula of:
(i) Sodium tetrahydridoborate(III).
(ii) Tetrahydroxo zincate(II) ion.

Specify which out of the following complex structures exhibit geometrical isomerism:
(a) Linear, (b) Square planar, (c) Tetrahedral, (d) Octahedral.

Write all isomers of [Co(C₂O₄)₃]^3–.

Draw structures of geometrical isomers of [Fe(NH₃)₂(CN)₄]^–.

Which isomer of [CoCl₂(en)₂]⁺ does not show optical isomerism?

Illustrate the geometrical isomers of [Pt(NH₃)₄Cl₂]⁺.

FeSO₄ solution mixed with (NH₄)₂SO₄ solution in 1 : 1 molar ratio gives the test of Fe²⁺ ion but CuSO₄ solution mixed with aqueous ammonia in 1:4 molar ratio does not give the test of Cu²⁺ ion. Explain why?

How many coordination sites are there in ethylene diamine CH₃NH₂?

What is the shape of [Co(NH₃)₆]³⁺ complex ion?

What is the oxidation state of Ni in Ni(CO)₄?

Give the geometry and magnetic character of [NiCl₄]^2–?

What is coordination number? Give coordination of Co in [Co(en)₃]³⁺ ion.

Identify the ligands in [Co(en)₂ Cl(ONO)]⁺ and write its IUPAC name.

Which of these cannot act as ligand and why: NH₃, H₂O, CO, CH₄ ?

NH₃ is strong ligand, NH₄⁺ ion is not, why?

Name the ionization isomer of [Cr(H₂O)₅Br]SO₄?

Write the IUPAC name for any of the isomers with the molecular formula [Pt(NH₃)₂Cl₂]Cl₂.

What is the coordination number of central metal ion in [Fe(C₂O₄)₃]^3–?

Name the type of isomerism exhibited by the following isomers.
[Pt(NH₃)₄] [PtCl₆] and [Pt(NH₃)₄Cl₂] [PtCl₄]

Write the IUPAC name of [Co(en)₂ (NH₃)₂]Cl₃.

Write the formula of the following complexes:
(i) Hexa-amine platinum(IV) chloride.
(ii) Dichloro tetra amine cobalt(III) ion.

What is the coordination number and oxidation state of aluminium in the complex ion [Al(H₂O)₄(OH)₂]⁺?

Write all the isomers of |Pt(SCN) (NH₃)₃] (SCN).

What is the oxidation state of gold in [Au(CN)₂]^–?

Which of the two is more stable K₄[Fe(CN)₆] or K₃[Fe(CN)₆].

Draw cis- and trans-isomers of [Pt(NH₃)₂Cl₂].

Write IUPAC name of K₃[Fe(C₂O₄)₃].

[Fe(CN)₆]^3– is weakly paramagnetic while [Fe(CNO)₆]^4– is diamagnetic, why?

A coordination compound has the formula CoCl₃.4NH₃. It does not liberate NH₃but forms a precipitate of AgCl on treatment with AgNO₃ solution. Write the structure and IUPAC name of the complex.

Write down the IUPAC names of the following compounds:

(i) [CO(NH₃)₅ONO ]Cl₂
(ii) K₃[Cr(CN)₆]

Write the IUPAC name for [Cr(NH₃)₅ CO₃]Cl.

Write the IUPAC name of [Ni(CN)₄]^2– ion?

Nickel carbonyl( NiCO₄) has tetrahedral geometry whereas [Pt(NH₃)₂Cl₂] is square planar.

Write the expression for the stability’ constant for [Cu(NH₃)₄]²⁺.

The value of equilibrium constants of [Cu(NH₃)₄]⁺ and [Co(NH₃)₆]³⁺ are 1.0 x 10^–12 and 6.2 x 10^–36 respectively. Which complex would be more stable and why ?

If the value of Δ₀ is less than P in the crystal field, write the arrangement of d⁴coordination entity in crystal field split.

There are two compounds [Cr(NH₃)₄]²⁺ and [Cr(CN)₄]^2– having 5.2 x 10¹¹ and 3.2 x 10²² respectively as their K values, which complex is more stable and which ligand NH₃or CN^– is a stronger ligand?

What is the significance of Δ₀?

Write IUPAC name of the complex [Co(NH₃)₅SCN]Cl₂.

Give the name of following complex using IUPAC norms:
[Co(en)₂(ONO)Cl]Cl.

Give the IUPAC name of [NH₄]₃ [Co(ONO)₆].

Write the IUPAC name of [Ni(H₂O)₆] (ClO₄)₂.

Name the ionisation isomer of [Cr(H₂O)₅Br]SO₄.

Why does [CoF₆]^3– give a high spin complex?

[Cu(CN)₄]²⁺ is more stable complex than [Cu(NH₃)₄]⁺. Why?

[Cu(NH₃)₄]²⁺ ion is coloured while [Cu(CN)]^3– ion is colourless. Why?

Identify the ligands in [Co(en)₂ ClONO]⁺.

What is the oxidation number of central atom in each of the following ?
(i) [Pt(NH₃)₆ Cl₄ (ii) Fe₄ [Fe(CN)₆]₃(iii) [Ni(CO)₄] (iv) Na[Hg(CN)₃]

What is the coordination number of central metal atom in the following?
(i) [Pt(NH₃)₃]Cl (ii) K₃[Fe(C₂O₄]₃]
(iii) [Fe(EDTA)] (iv) [Rh{P(C₆.H₅)₃}₃]Cl

State the kind of isomerism possible for the following:
(i) [Cr(en)₃]³⁺ (ii) [Cr(NH₃)₄ ClBr]Br (iii) [Cr(NH₃)₄ Br₂l₂SO₄

Write down the IUPAC names of the following compounds:
(i) [Co(NH₃)₅ONO]Cl₂, (ii) K₃[Cr(CN)₆]

Give one use of Ni(CO)₄.

What is the oxidation state of the metal in the following coordiantion compound?
(i) Ni in Ni(CO)₄ (ii) Co in [Co(CO) ₄]^–

If the geometry of [PtCl₄]^2– is square planar, which orbitals of Pt are involved in the bonding?

What is the charge on the complex of Pt²⁺ in which the ligands are - one water molecule, one pyridine molecule and one ethylene diamine molecule?

Write down the IUPAC names of the following compounds:
(i) [Co(NH₃)₅ONO]Cl₂, (ii) K₃[Cr(CN)₆]
(iii) [Cr(NH₃)₅CO₃]Cl

Write formula of the following complexes:
(i) Penta amine chlorocobalt(II)
(ii) Lithium tetrahydro aluminate(III).

Which of the following will give white precipitate with AgNO₃ solution:
[Pt(NH₃)₂Cl₄], K[Pt(NH₃)Cl₅], [Pt(NH₃)₃ Cl₃]Cl?

How many moles of ions are formed when one mole of the complex, [Co(NH₃)₄Cl₂]Cl is completely dissociated into ions?

How many isomers are there for octahedral complex [CoCl₂(en)(NH₃)₂]⁺

In the complex [SbF₅]^2–, sp³d hybridization is present. What would be the geometry of the complex ?