Nomenclature of Coordination Compounds - UNSOLVED PRACTICE SET
Chapter: Coordination Compounds | Topic: Nomenclature of Coordination Compounds
NOMENCLATURE OF COORDINATION COMPOUNDS - UNSOLVED PRACTICE SET
Topic: Nomenclature of Coordination Compounds
Multiple Choice Questions
Q1. According to IUPAC nomenclature, the ligands in a coordination compound are named:
- Before the central metal atom, in alphabetical order
- After the central metal atom, in order of complexity
- Before the central metal atom, in order of their charge
- After the central metal atom, in alphabetical order
Q2. The IUPAC name of [Co(NH₃)₆]Cl₃ is:
- Hexaamminecobalt(III) chloride
- Cobalt(III) hexaammine chloride
- Hexaamminecobalt chloride
- Cobalt hexaammine(III) chloride
Q3. In naming a coordination compound, if the coordination entity is an anion, the suffix added to the metal name is:
- -ium
- -ate
- -ic
- -ous
Q4. The IUPAC name of K₄[Fe(CN)₆] is:
- Potassium hexacyanoferrate(II)
- Potassium hexacyanoferrate(III)
- Potassium ferrocyanide
- Potassium ferricyanide
Q5. The formula for tetraamminedichloridocobalt(III) chloride is:
- [Co(NH₃)₄Cl]Cl₂
- [Co(NH₃)₄Cl₂]Cl
- [Co(NH₃)₂Cl₄]
- [Co(NH₃)₄]Cl₃
Q6. While naming a complex, the oxidation state of the central metal is indicated by:
- A Roman numeral in parentheses after the metal name
- A prefix before the metal name
- A suffix after the metal name
- A superscript on the metal symbol
Short Answer Questions
Q7. Write the IUPAC names of the following:
(a) [Ni(CO)₄]
(b) [CoCl₂(en)₂]⁺
(c) K₃[Al(C₂O₄)₃]
Q8. Write the formulae of the following coordination compounds:
(a) Potassium hexacyanidoferrate(III)
(b) Diamminesilver(I) dicyanidoargentate(I)
(c) Tris(ethane-1,2-diamine)cobalt(III) sulphate
Q9. Why is the common name "potassium ferrocyanide" not acceptable as an IUPAC name for K₄[Fe(CN)₆]? Write its correct IUPAC name.
Q10. In the naming of [Pt(NH₃)₂Cl₂], why is "ammine" written before "chlorido" even though 'c' comes before 'a' alphabetically?
Q11. Write the IUPAC name of [Cr(NH₃)₅(H₂O)]Cl₃. Explain the rules you applied in determining the name.
Q12. What is the difference between writing "chloro" and "chlorido" in IUPAC nomenclature? Which one is the recommended form now?
Long Answer Questions
Q13. State the rules for naming coordination compounds according to IUPAC nomenclature. Illustrate each rule with a suitable example.
Q14. (a) Write the IUPAC names of the following complexes:
(i) [Co(NH₃)₅ONO]²⁺
(ii) [Fe(CN)₆]³⁻
(iii) [Pt(py)₄][PtCl₄]
(iv) [CrCl₂(H₂O)₄]Cl·2H₂O
plain
(b) Write the formulae for:
(i) Bis(ethane-1,2-diamine)dichloridochromium(III) chloride
(ii) Sodium dicyanidoaurate(I)
Q15. (a) Explain why the name "tetraamminedichlorocobalt(III) chloride" is not the correct IUPAC name for [Co(NH₃)₄Cl₂]Cl. Write the correct name and explain the rules applied.
(b) A student writes the name of [NiCl₄]²⁻ as "tetrachloronickelate(II) ion." Is this correct? If not, write the correct IUPAC name and explain the error.
Numerical / Application-Based Problems
Q16. Your chemistry teacher gives you five unlabeled bottles containing the following complexes:
A: [Co(NH₃)₆]Cl₃
B: [Co(NH₃)₅Cl]Cl₂
C: [Co(NH₃)₄Cl₂]Cl
D: [Co(NH₃)₃Cl₃]
E: K₃[Co(CN)₆]
(a) Write the correct IUPAC name of each compound.
(b) Identify which compounds will conduct electricity in aqueous solution and classify them as strong, weak, or non-electrolytes.
(c) Which compound(s) will give a white precipitate with AgNO₃ solution? How many moles of AgCl will form per mole of each compound?
(d) One of these compounds shows geometrical isomerism. Identify it and name the isomers using cis-trans nomenclature.
Q17. A coordination compound is analyzed and found to contain:
Cobalt: 1 atom
Ammonia: 5 molecules
Chloride: 3 ions (as determined by precipitation with AgNO₃)
Water: 1 molecule (inside the coordination sphere)
(a) Write the formula of the compound.
(b) Write its correct IUPAC name.
(c) Draw the structure of the coordination entity.
(d) What is the oxidation state of cobalt in this complex?
(e) Is this complex expected to be coloured? Give a reason.
Q18. In your school practical examination, you are asked to identify an unknown coordination compound. The compound has the following characteristics:
Molecular formula: PtCl₂(NH₃)₂
Does not conduct electricity in solution
Does not react with AgNO₃ solution
Has two different forms with different biological activities
(a) Write the structural formula of the compound.
(b) Write its IUPAC name.
(c) Explain why it does not react with AgNO₃.
(d) Name the type of isomerism exhibited and draw the structures of both isomers.
(e) One isomer is used as an anti-cancer drug. Which one is it, and why is its shape important? (Name the isomer only.)