With O highest possible oxidation state of Mn is

Options

A. `+7`
B. `+ 4`
C. `+5`
D. `+3`

Answer

To determine the highest possible oxidation state of manganese (Mn) when combined with oxygen (O), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Element and Its Oxidation States**:
- Manganese is a transition metal that can exhibit multiple oxidation states. The common oxidation states of manganese include +2, +4, +5, and +7.

2. **Determine the Maximum Oxidation State**:
- The highest oxidation state of manganese is +7. This is a well-known fact in inorganic chemistry.

3. **Consider the Compound Formed with Oxygen**:
- When manganese is in its highest oxidation state, it can form a compound with oxygen. The relevant compound is manganese heptoxide, which is represented as Mn2O7.

4. **Calculate the Oxidation State in Mn2O7**:
- In the compound Mn2O7, we can set up the equation to find the oxidation state of manganese (let's denote it as x):
\[ 2x + 7(-2) = 0 \]
- Here, the oxidation state of each oxygen is -2 and there are 7 oxygen atoms.

5. **Solve the Equation**:
- Rearranging the equation gives:
\[ 2x - 14 = 0 \]
\[ 2x = 14 \]
\[ x = +7 \]

6. **Conclusion**:
- The highest oxidation state of manganese when combined with oxygen is +7.

### Final Answer:
The highest possible oxidation state of manganese (Mn) with oxygen (O) is **+7**.

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