Incorrect statement about `Mn_(2)O_(7)` is :

Options

A. It is a covalent oxide
B. `Mn-O-Mn` linkage is present
C. It is purple in colour
D. Mn is tetrahedrally surrounded by O atoms

Answer

To determine the incorrect statement about \( \text{Mn}_2\text{O}_7 \), let's analyze each of the provided statements step by step.

### Step 1: Analyze the nature of \( \text{Mn}_2\text{O}_7 \)
- The oxidation state of manganese (Mn) in \( \text{Mn}_2\text{O}_7 \) is +7.
- In general, elements in higher oxidation states tend to form covalent bonds, especially with nonmetals like oxygen.
- Therefore, \( \text{Mn}_2\text{O}_7 \) is indeed covalent in nature.

**Hint:** Higher oxidation states of transition metals typically lead to covalent bonding.

### Step 2: Check for MnO-Mn linkage
- In \( \text{Mn}_2\text{O}_7 \), there are indeed Mn-O-Mn linkages present.
- This statement is correct.

**Hint:** Look for structural features that indicate bonding between manganese atoms.

### Step 3: Determine the color of \( \text{Mn}_2\text{O}_7 \)
- \( \text{Mn}_2\text{O}_7 \) is known to be green in color, not purple.
- Therefore, this statement is incorrect.

**Hint:** Recall the characteristic colors of transition metal oxides.

### Step 4: Examine the hybridization and geometry
- In \( \text{Mn}_2\text{O}_7 \), each manganese atom is surrounded by four oxygen atoms.
- The hybridization of manganese in this compound is \( sp^3 \), which corresponds to a tetrahedral arrangement.
- Thus, the statement about manganese being tetrahedrally surrounded by oxygen atoms is correct.

**Hint:** Use VSEPR theory to determine the geometry based on the number of bonds and lone pairs.

### Conclusion
The incorrect statement about \( \text{Mn}_2\text{O}_7 \) is that it is purple in color. The correct color is green.

**Final Answer:** The incorrect statement is that \( \text{Mn}_2\text{O}_7 \) is purple in color.