`PCl_(3)` reacts with water to form :

Options

A. `PH_(3)`
B. `H_(3)PO_(3).HCl`
C. `POCl_(3)`
D. `H_(3)PO_(4)`

Explanation

To determine the products formed when phosphorus trichloride (PCl₃) reacts with water, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are phosphorus trichloride (PCl₃) and water (H₂O).

### Step 2: Write the Initial Reaction
When PCl₃ reacts with water, it undergoes hydrolysis. The initial reaction can be written as:
\[ \text{PCl}_3 + \text{H}_2\text{O} \rightarrow \text{POCl}_3 + \text{HCl} \]

### Step 3: Identify the First Product
The first product formed from this reaction is phosphorus oxychloride (POCl₃) along with hydrochloric acid (HCl).

### Step 4: Further Reaction of the First Product
Since water is present in excess, the phosphorus oxychloride (POCl₃) can further react with water:
\[ \text{POCl}_3 + \text{H}_2\text{O} \rightarrow \text{H}_3\text{PO}_3 + \text{HCl} \]

### Step 5: Identify the Final Products
From the second reaction, the final products formed are phosphorous acid (H₃PO₃) and hydrochloric acid (HCl).

### Step 6: Summarize the Overall Reaction
Combining both steps, the overall reaction can be summarized as:
\[ \text{PCl}_3 + 3\text{H}_2\text{O} \rightarrow \text{H}_3\text{PO}_3 + 3\text{HCl} \]

### Conclusion
The products formed when PCl₃ reacts with water are phosphorous acid (H₃PO₃) and hydrochloric acid (HCl).

### Final Answer
The correct answer is **H₃PO₃ and HCl**.

---