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Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine

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3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Which of the following complexes are heteroleptic?

A: [Cr(NH3)6]3+ 

B: [Fe(NH3)4Cl]+ 

C: [Mn(CN)6]4- 

D: [Co(NH3)6Cl2]
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V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: B and D

Heteroleptic is a compound that contains many ligands of various sorts. NH3 and 

Cl as a ligand or also called as donor groups, is a heteroleptic complex.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Which of the following complexes are homoleptic?

A: [Co(NH3)6]3+ 

B: [Co(NH3)4]+ 

C: 4[Ni(CN)4]2- 

D: [Ni(NH3)4Cl2]
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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct options: A, B and C

A homoleptic complex is one that has only one species or group as a ligand.

Option A, B, and C each have only one ligand, but option D has two.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

An aqueous pink solution of cobalt (II) chloride changes to deep blue on addition of excess of HCl. This is because____________.

A: [Co(H2O)]2+ is transformed into [CoCl6]4- 

B: [Co(H2O)6]2+ is transformed into [CoCl4]2- 

C: Tetrahedral complexes have smaller crystal field splitting than octahedral complexes. 

D: Tetrahedral complexes have larger crystal field splitting than octahedral complex.
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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: B and C

[Co (H2O)6]2+  is increased when excess of HCl is added. Tetrahedral complexes have smaller crystal field splitting than octahedral complexes because Δt = 4 9 Δ0

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Which of the following options are correct for [Fe(CN)6]3 -  complex?

A: d2sp3 hybridisation 

B: sp3d2 hybridisation

C: Paramagnetic 

D: Diamagnetic
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V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A and C

For answer at (A) Atomic number of Iron is 26 . In ferricyanide complex, iron is in oxidation state of 3+. The orbitals on the metal atom undergoes d2sp3 hybridizaion and hence the complex has octahedral shape.

Also it can be said that, [Fe (CN)6]3- has one unpaired electron which makes it weakiy paramagnetic. Therefore, option C is also correct.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Atomic number of Mn, Fe, Co and Ni are 25, 26 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?

A: [MnCl6]3- 

B: [FeF6]3- 

C: [CoF6]3- 

D: [Ni(NH3)6]2+
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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A and C

The outer octahedral complexes are weak ligands, number of pairing electrons and high spinning potential.

[MnCl6]3-   - electronic configuration of Mn = 3d5,4s2. Shifting the valence electrons become 

Mn3+ ,3d4 and number of unpaired electrons is 4.

[FeF6]3- - electronic configuration of Fe = 3d6,4s2. Shifting the valence electrons become

Fe3+ ,3d5 and the number of unpaired electrons is 5.

[CoF6]3 - electronic configuration of Co  =  3d7,4s2 shifting the valence electrons become

 Fe3+ ,3d6

...more

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Atomic numbers of Mn, Fe, and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamagnetic?

A: [Co(NH3)6]3+ 

B: [Mn(CN)6]3- 

C: [Fe(CN)6]4- 

D: [Fe(CN)6]3- 
0 Follower 2 Views

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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A and C

(i) Orbitals of Co3+ ion d2sp3 hybridised orbitals of Co3+ [Co (NH3)6]3+ (inner orbital or low spin complex)

No. of unpaired electron =0

Magnetic property = diamagnetic, due to absence of unpaired electrons

(ii) Electronic configuration is 3 d6 orbitals of Fe2+ ion:

As CN−is a strong field ligand, it causes the pairing of the unpaired 3d electrons. Since there are six ligands around the central metal ion, the most feasible hybridization d2sp3⋅d2sp3 hybridized oribtals of Fe2+ are:

6 electron pairs from CN− ions occupy the six hybrid d

...more

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

IUPAC name of [Pt(NH3)2Cl(NO2)] is 

A: Platinum diaminechloronitrite

B: Chloronitrito-N-ammineplatinum (II)

C Diamminechloridonitrito-N-platinum (II) 

D Diamminechloronitrito-N-platinate (II)
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Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: C

[Pt (NH3)2Cl (NO2)] is a neutral molecule. Ligands are arranged alphabetically.

So, NH3 Diammine, chloride and the embedded linkage is nitrogen and last is the metal name.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

What kind of isomerism exists between [Cr(H2O)6]Cl3 (violet) and [Cr(H2O)5Cl]Cl2⋅H2O (greyish-green)?

A: Linkage isomerism

B: Solvate isomerism

C: Ionisation isomerism 

D: Coordination isomerism
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V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: B

Hydrate isomerism is isomerism in which water is used as a solvent.

Coordination compounds with the same composition but varying ligand connectivity are known as linkage isomers.

Solvate isomerism has the same composition as free solvent but distinct solvent ligand molecules.

Except for the ligand that swaps places with the anion, ionisation isomers are identical isomers.

Coordination isomers are coordination compounds with distinct metal and ligand compositions.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

Which of the following species is not expected to be a ligand?

A: NO

B: NH4+ 

C: NH2CH2CH2NH2

D: CO
0 Follower 4 Views

V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: B

Ligands are neutral ions that form a coordination complex with the central metal atom.

NH4+  does not have a lone pair of electrons to give.

New answer posted

3 months ago

Chemistry NCERT Exemplar Solutions Class 12th Chapter Nine Coordination Compounds

A chelating agent has two or more than two donor atoms to bind to a single metal ion. Which of the following is not a chelating agent?

A: Thiosulphato 

B: Oxalato 

C Glycinato

D: Ethane-1,2-diamine
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V
Vishal Baghel

Contributor-Level 10

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: Correct option: A

A chelating agent binds to a single metal ion with two or more donor atoms. Oxaloto, Glycinato, and ethane-1,2-diamine all have two donor oxygen atoms. The gland Thiosulpato is ambidentate.

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