Give three examples each of solid, liquid and gaseous covalent compounds.

Explanation

**Step-by-Step Solution:**

1. **Understanding Covalent Compounds:**
- Covalent compounds are formed by the sharing of electrons between atoms to complete their octet. This means that atoms share their valence electrons to achieve a stable electron configuration.

2. **Examples of Solid Covalent Compounds:**
- **Phosphorus Pentachloride (PCl5):**
- PCl5 has a trigonal bipyramidal structure where phosphorus is the central atom bonded to five chlorine atoms. The bonds formed are covalent.
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