`PCl_(3)` is covalent. It fumes in moisture and its aqueous solution is electrical conductor. Why? 

Explanation

To understand why \( PCl_3 \) is covalent, fumes in moisture, and its aqueous solution is an electrical conductor, we can break down the explanation into several steps:

### Step 1: Nature of \( PCl_3 \)
- **Explanation**: \( PCl_3 \) (phosphorus trichloride) is classified as a covalent compound because it is formed by the sharing of electrons between phosphorus (P) and chlorine (Cl) atoms. In covalent compounds, the bond formed does not involve the complete transfer of electrons as seen in ionic compounds.

### Step 2: Reaction with Moisture
- **Explanation**: When \( PCl_3 \) comes into contact with moisture (water), it reacts to form hydrochloric acid (HCl) and phosphorous acid (\( H_3PO_3 \)). The reaction can be represented as:
\[
...