Question:
Identify oxidation state of cobalt ion in the complex, \([\text{Co(NH}_3)_5\text{Br}]\text{SO}_4\) .
Identify oxidation state of cobalt ion in the complex, \([\text{Co(NH}_3)_5\text{Br}]\text{SO}_4\) .
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Sulfate carries -2, so the complex ion is +2; ammonia is neutral and bromide is -1.
Updated On: Oct 1, 2026
- \(+2\)
- \(+3\)
- \(+1\)
- \(+4\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The charge on the complex ion is set by the counter ion outside the brackets.
Step 2: Detailed Explanation:
Sulfate is \(\text{SO}_4^{2-}\), so the complex ion \([\text{Co(NH}_3)_5\text{Br}]\) has charge \(+2\).
Let the oxidation state of Co be \(x\). \(\text{NH}_3\) is neutral (0), and \(\text{Br}^-\) contributes \(-1\).
\[ x + 5(0) + (-1) = +2 \Rightarrow x = +3 \]
So cobalt is in the +3 state.
Step 3: Final Answer:
Option (B), \(+3\).
Final Answer:
Co is +3 in the complex. \[ \boxed{\text{(B) }+3} \]
The charge on the complex ion is set by the counter ion outside the brackets.
Step 2: Detailed Explanation:
Sulfate is \(\text{SO}_4^{2-}\), so the complex ion \([\text{Co(NH}_3)_5\text{Br}]\) has charge \(+2\).
Let the oxidation state of Co be \(x\). \(\text{NH}_3\) is neutral (0), and \(\text{Br}^-\) contributes \(-1\).
\[ x + 5(0) + (-1) = +2 \Rightarrow x = +3 \]
So cobalt is in the +3 state.
Step 3: Final Answer:
Option (B), \(+3\).
Final Answer:
Co is +3 in the complex. \[ \boxed{\text{(B) }+3} \]
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