CBSE Class 12
Chemistry Important
Question
Isomerism In Coordination
Compounds
VERY SHORT ANSWER TYPE QUESTIONS 1 Marks Questions
1. What are ambidentate ligands? Give two examples for each.
Ans. Ambidentate ligands are ligands that can attach themselves to the central metal
atom through two different atoms. For example:
a.
b.
2. Using IUPAC norms write the formula for the following:
Tetrahydroxozincate(II) Ans. [Zn(OH4)2-
3. Using IUPAC norms write the formula for the following:
Hexaamminecobalt(III) sulphate
Ans. [Co(NH3)6]2 (SO4)3
4. Using IUPAC norms write the formula for the following:
Pentaamminenitrito-O- cobalt(III)
Ans. [Co(ONO) (NH3)5]2+
5. Using IUPAC norms write the systematic name of the following:
[Co(NH3)6]Cl3 Ans. Hexaamminecobalt(III) chloride
6. Using IUPAC norms write the systematic name of the following:
[Pt(NH3)2Cl(NH2CH3)]Cl
Ans. Diamminechlorido(methylamine) platinum(II) chloride
7. Using IUPAC norms write the systematic name of the following: c[Cr(C2O4)3]3+
1/
8
, Ans. Tris(ethane-1, 2-diammine) cobalt(III) ion
8. Draw the structures of optical isomers of: c[Cr(C2O4)3]3–
Ans.
9. What is meant by the chelate effect? Give an example.
Ans. When a ligand attaches to the metal ion in a manner that forms a ring, then the
metal- ligand association is found to be more stable
SHORT ANSWER TYPE QUESTIONS 2/3 MARK QUESTIONS
1. What is Spectro chemical series? Explain the difference between a weak field ligand
and a strong field ligand.
Ans. A Spectro chemical series is the arrangement of common ligands in the increasing order
of their crystal-field splitting energy (CFSE) values.
I- < BR - < S2- < SCN- < Cl-<N3,<F-<OH-<C2O42-~H2O-~NCS-~H-<CN-<NH3<en~ SO32-
<NO2-
<phen<CO
2. [Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2− is diamagnetic. Explain why?
Ans. Cr is in the +3 oxidation state i.e., d3 configuration. Also, NH3 is a weak field ligand that
does not cause the pairing of the electrons in the 3d orbital. Cr3+:
2/
8
Chemistry Important
Question
Isomerism In Coordination
Compounds
VERY SHORT ANSWER TYPE QUESTIONS 1 Marks Questions
1. What are ambidentate ligands? Give two examples for each.
Ans. Ambidentate ligands are ligands that can attach themselves to the central metal
atom through two different atoms. For example:
a.
b.
2. Using IUPAC norms write the formula for the following:
Tetrahydroxozincate(II) Ans. [Zn(OH4)2-
3. Using IUPAC norms write the formula for the following:
Hexaamminecobalt(III) sulphate
Ans. [Co(NH3)6]2 (SO4)3
4. Using IUPAC norms write the formula for the following:
Pentaamminenitrito-O- cobalt(III)
Ans. [Co(ONO) (NH3)5]2+
5. Using IUPAC norms write the systematic name of the following:
[Co(NH3)6]Cl3 Ans. Hexaamminecobalt(III) chloride
6. Using IUPAC norms write the systematic name of the following:
[Pt(NH3)2Cl(NH2CH3)]Cl
Ans. Diamminechlorido(methylamine) platinum(II) chloride
7. Using IUPAC norms write the systematic name of the following: c[Cr(C2O4)3]3+
1/
8
, Ans. Tris(ethane-1, 2-diammine) cobalt(III) ion
8. Draw the structures of optical isomers of: c[Cr(C2O4)3]3–
Ans.
9. What is meant by the chelate effect? Give an example.
Ans. When a ligand attaches to the metal ion in a manner that forms a ring, then the
metal- ligand association is found to be more stable
SHORT ANSWER TYPE QUESTIONS 2/3 MARK QUESTIONS
1. What is Spectro chemical series? Explain the difference between a weak field ligand
and a strong field ligand.
Ans. A Spectro chemical series is the arrangement of common ligands in the increasing order
of their crystal-field splitting energy (CFSE) values.
I- < BR - < S2- < SCN- < Cl-<N3,<F-<OH-<C2O42-~H2O-~NCS-~H-<CN-<NH3<en~ SO32-
<NO2-
<phen<CO
2. [Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2− is diamagnetic. Explain why?
Ans. Cr is in the +3 oxidation state i.e., d3 configuration. Also, NH3 is a weak field ligand that
does not cause the pairing of the electrons in the 3d orbital. Cr3+:
2/
8
