In white phosphorous `/_ PPP = 90^@`.

Explanation

To determine whether the statement "In white phosphorus, the bond angle P-P-P is 90 degrees" is true or false, we can follow these steps:

### Step 1: Understand the structure of white phosphorus
White phosphorus consists of P4 molecules, where four phosphorus atoms are arranged in a specific geometric structure.

**Hint:** Consider the molecular geometry of P4 and how the phosphorus atoms are arranged.

### Step 2: Identify the geometry of P4
The structure of white phosphorus (P4) is a regular tetrahedron. In this arrangement, each phosphorus atom is bonded to three other phosphorus atoms.

**Hint:** Recall the shape of a tetrahedron and how angles are formed between the bonds.

### Step 3: Determine the bond angles
In a tetrahedral geometry, the bond angles between the bonds are approximately 109.5 degrees. However, in the case of white phosphorus, the bond angle between the phosphorus atoms is not 90 degrees.

**Hint:** Compare the bond angles in a tetrahedral structure with the claim made in the statement.

### Step 4: Analyze the bond angles in white phosphorus
The bond angle between the P-P-P bonds in white phosphorus is actually about 60 degrees, not 90 degrees. Each phosphorus atom has one lone pair, which affects the bond angles slightly but does not change the fundamental geometry.

**Hint:** Think about how lone pairs influence bond angles in molecular geometry.

### Step 5: Conclusion
Since the bond angle in white phosphorus is 60 degrees and not 90 degrees, the statement "In white phosphorus, the bond angle P-P-P is 90 degrees" is false.

**Final Answer:** The statement is false.

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