Question

Identify the ligands present Pentaamminecarbonatocobalt(III)chloride.

• A. \(\mathrm{NH}_{3}\) and \(\mathrm{Cl}^{-}\)
• B. \(\mathrm{Cl}^{-}\)and \(\mathrm{CO}_{3}^{--}\)
• C. \(\mathrm{CO}_{3}^{--}\)and \(\mathrm{NH}_{3}\)
• D. \(\mathrm{NH}_{3},\mathrm{CO}_{3}^{--}\)and \(\mathrm{Cl}^{-}\)

Hint:

Ligands are named inside the coordination sphere; chloride outside the bracket is a counter ion.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
The name gives ligands first, then the metal and its oxidation state, then the counter ion.

Step 2: Decode the name
Pentaammine means 5 \(\text{NH}_3\). Carbonato means \(\text{CO}_3^{2-}\). Cobalt(III) is the metal.

Step 3: Write the formula
\([\text{Co}(\text{NH}_3)_5\text{CO}_3]\text{Cl}\). Chloride is outside the bracket, so it is a counter ion and not a ligand.

Final Answer:
The ligands are ammonia and carbonate. \[ \boxed{\text{(C) }\text{CO}_3^{2-}\text{ and NH}_3} \]