In which of the following forms do electrovalent compounds conduct electricity?

Options

A. only in solid form
B. both in solid form and in aqueous solution
C. both in aqueous solution and in molten form
D. in solid form, molten form and in aqueous solution

Answer

To determine in which forms electrovalent compounds conduct electricity, we need to analyze the behavior of these compounds in different states. Let's break down the solution step by step:

### Step 1: Understand 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.

**Hint:** Remember that electrovalent compounds consist of ions, which are crucial for conducting electricity.

### Step 2: Analyze Solid Form
In the solid state, electrovalent compounds (like NaCl) are arranged in a rigid lattice structure. The ions are held tightly in place and cannot move freely.

**Hint:** Think about the structure of solid ionic compounds and how it affects the movement of ions.

### Step 3: Conductivity in Solid Form
Since the ions in solid electrovalent compounds cannot move, they cannot conduct electricity. Therefore, electrovalent compounds do not conduct electricity in solid form.

**Hint:** Recall that movement of charged particles is necessary for electrical conduction.

### Step 4: Analyze Aqueous and Molten Forms
When electrovalent compounds are dissolved in water (aqueous solution) or melted (molten form), the rigid structure breaks down. The ions become free to move.

**Hint:** Consider what happens to the ionic bonds when the compound is dissolved or melted.

### Step 5: Conductivity in Aqueous and Molten Forms
In both aqueous and molten states, the ions are free to move. This movement allows the electrovalent compounds to conduct electricity effectively.

**Hint:** Remember that free-moving ions are essential for conduction.

### Conclusion
Electrovalent compounds conduct electricity in both aqueous solution and molten form, but not in solid form.

**Final Answer:** Electrovalent compounds conduct electricity in aqueous solution and molten form.