In the solid state, electrovalent compounds are poor conductor of electricity. Give reason.

Explanation

**Step-by-Step Solution:**

1. **Understanding Electrovalent Compounds**: Electrovalent compounds, also known as ionic compounds, are formed by the transfer of electrons from one atom to another, resulting in the formation of positively and negatively charged ions.

2. **Nature of Solid State**: In the solid state, electrovalent compounds have a rigid structure. The ions are held together in a fixed position by strong electrostatic forces of attraction between the oppositely charged ions.

3. **Conduction of Electricity**: The conduction of electricity requires the movement of charged particles. In the case of ionic compounds, this movement can occur through the movement of ions.

...