
What is the oxidation state of \[Co\] in the complex ${{[Co{{({{H}_{2}}O)}_{5}}Cl]}^{2+}}$
A. 2
B. 3
C. 1
D. 4
Answer
162.9k+ views
Hint: The complex is a cationic complex . Here water is a neutral ligand and chlorine is a negative ligand. By summing the charges of the ligands we can calculate the oxidation state of the central atom.
Complete Step by Step Solution:
Here the given complex is ${{[Co{{({{H}_{2}}O)}_{5}}Cl]}^{2+}}$.
Here two types of ligands are attached to the central metal atom that is cobalt. The ligands are five water ligands and one chloride ligand.
Let the oxidation state of $Co$ is $x$ .
As water is a neutral ligand so, the charge on water is $0$ .
Again chloride is a negative ligand so, the charge of chloride ligand is $-1$ .
The overall charge of the given complex is $+2$ .
Thus we can write as follows:
$ x+0\times 5+(-1)=+2 \\ $
$ x-1=2 \\ $
$ x=+3 \\ $
So, the value of $x$ by solving the above equation is $+3$ .
So, the oxidation state of the central metal atom cobalt is also $+3$ .
Thus the correct option is B.
Additional information: Cobalt is a transition element. In the $+3$ oxidation state the metal $d$ orbital has $6$ electrons and acts as an oxidising agent.
Note: Thus cobalt have low electron density and easily accepts electrons and acts as a oxidizing agent. Here cobalt exist as a high spin complex.
Complete Step by Step Solution:
Here the given complex is ${{[Co{{({{H}_{2}}O)}_{5}}Cl]}^{2+}}$.
Here two types of ligands are attached to the central metal atom that is cobalt. The ligands are five water ligands and one chloride ligand.
Let the oxidation state of $Co$ is $x$ .
As water is a neutral ligand so, the charge on water is $0$ .
Again chloride is a negative ligand so, the charge of chloride ligand is $-1$ .
The overall charge of the given complex is $+2$ .
Thus we can write as follows:
$ x+0\times 5+(-1)=+2 \\ $
$ x-1=2 \\ $
$ x=+3 \\ $
So, the value of $x$ by solving the above equation is $+3$ .
So, the oxidation state of the central metal atom cobalt is also $+3$ .
Thus the correct option is B.
Additional information: Cobalt is a transition element. In the $+3$ oxidation state the metal $d$ orbital has $6$ electrons and acts as an oxidising agent.
Note: Thus cobalt have low electron density and easily accepts electrons and acts as a oxidizing agent. Here cobalt exist as a high spin complex.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main 2025 Session 2: Exam Date, Admit Card, Syllabus, & More

JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Trending doubts
Types of Solutions

Degree of Dissociation and Its Formula With Solved Example for JEE

Classification of Drugs

Instantaneous Velocity - Formula based Examples for JEE

JEE Main Chemistry Question Paper with Answer Keys and Solutions

JEE Main Chemistry Online Mock Test for Class 12

Other Pages
Haloalkanes and Haloarenes

Alcohol Phenol and Ether Class 12 Notes: CBSE Chemistry Chapter 7

Coordination Compounds Class 12 Notes: CBSE Chemistry Chapter 5

NCERT Solutions for Class 12 Chemistry In Hindi Chapter 10 Haloalkanes and Haloarenes In Hindi Mediem

Total MBBS Seats in India 2025: Government College Seat Matrix

NEET Total Marks 2025: Important Information and Key Updates
